diff --git a/src/emscripten/mako.cpp b/src/emscripten/mako.cpp
index e0db227..1a71362 100644
--- a/src/emscripten/mako.cpp
+++ b/src/emscripten/mako.cpp
@@ -50,13 +50,11 @@ void MAKO::play_music(int page)
 		EM_ASM_ARGS({ xsystem35.cdPlayer.play($0, $1); },
 					cd_track[page] + 1, next_loop ? 0 : 1);
 	} else {
-		DRI dri;
-		int size;
-		uint8* data = dri.load(amus, page, &size);
-		if (!data)
+		std::vector<uint8_t> data = dri_load(amus, page);
+		if (data.empty())
 			return;
 		int rate = EM_ASM_INT({ return xsystem35.audio.enable_audio_hook(); });
-		fm = std::make_unique<MakoYmfm>(rate, data, true);
+		fm = std::make_unique<MakoYmfm>(rate, std::move(data));
 	}
 
 	current_music = page;
@@ -110,39 +108,33 @@ void MAKO::play_pcm(int page, bool loop)
 		0x00, 0x00, 0x00, 0x00
 	};
 
-	uint8* wav_buffer;
-	uint8* buffer;
-	int size;
-	DRI* dri = new DRI();
+	// WAV形式 (Only You)
+	std::vector<uint8_t> wav_buffer = dri_load("AWAV.DAT", page);
+	if (wav_buffer.empty()) {
+		std::vector<uint8_t> buffer = dri_load("AMSE.DAT", page);
+		if (!buffer.empty()) {
+			// AMSE形式 (乙女戦記)
+			int samples = (buffer.size() - 12) * 2;
+			int total = samples + 0x24;
 
-	if ((buffer = dri->load("AWAV.DAT", page, &size)) != NULL) {
-		// WAV形式 (Only You)
-		wav_buffer = buffer;
-	} else if ((buffer = dri->load("AMSE.DAT", page, &size)) != NULL) {
-		// AMSE形式 (乙女戦記)
-		int total = (size - 12) * 2 + 0x24;
-		int samples = (size - 12) * 2;
-
-		wav_buffer = (uint8*)malloc(total + 8);
-		memcpy(wav_buffer, header, 44);
-		wav_buffer[ 4] = (total >>  0) & 0xff;
-		wav_buffer[ 5] = (total >>  8) & 0xff;
-		wav_buffer[ 6] = (total >> 16) & 0xff;
-		wav_buffer[ 7] = (total >> 24) & 0xff;
-		wav_buffer[40] = (samples >>  0) & 0xff;
-		wav_buffer[41] = (samples >>  8) & 0xff;
-		wav_buffer[42] = (samples >> 16) & 0xff;
-		wav_buffer[43] = (samples >> 24) & 0xff;
-		for(int i = 12, p = 44; i < size; i++) {
-			wav_buffer[p++] = buffer[i] & 0xf0;
-			wav_buffer[p++] = (buffer[i] & 0x0f) << 4;
+			wav_buffer.resize(total + 8);
+			memcpy(wav_buffer.data(), header, 44);
+			wav_buffer[ 4] = (total >>  0) & 0xff;
+			wav_buffer[ 5] = (total >>  8) & 0xff;
+			wav_buffer[ 6] = (total >> 16) & 0xff;
+			wav_buffer[ 7] = (total >> 24) & 0xff;
+			wav_buffer[40] = (samples >>  0) & 0xff;
+			wav_buffer[41] = (samples >>  8) & 0xff;
+			wav_buffer[42] = (samples >> 16) & 0xff;
+			wav_buffer[43] = (samples >> 24) & 0xff;
+			for (size_t i = 12, p = 44; i < buffer.size(); i++) {
+				wav_buffer[p++] = buffer[i] & 0xf0;
+				wav_buffer[p++] = (buffer[i] & 0x0f) << 4;
+			}
 		}
-		free(buffer);
-		size = total + 8;
 	}
-	if (muspcm_load_data(wav_buffer, size) == 0)
+	if (muspcm_load_data(wav_buffer.data(), wav_buffer.size()) == 0)
 		EM_ASM({ xsystem35.audio.pcm_start(0, $0); }, loop ? 0 : 1);
-	free(wav_buffer);
 }
 
 void MAKO::stop_pcm() {
diff --git a/src/fm/mako_ymfm.cpp b/src/fm/mako_ymfm.cpp
index c989c24..a0a5efc 100644
--- a/src/fm/mako_ymfm.cpp
+++ b/src/fm/mako_ymfm.cpp
@@ -7,8 +7,8 @@ int16_t mixSample(int32_t fm, int32_t ssg) {
 	return ymfm::clamp(fm * 2 + ssg / 2, -32768, 32767);
 }
 
-MakoYmfm::MakoYmfm(int rate, const uint8_t* data, bool free_data) :
-	MakoFM(data, free_data),
+MakoYmfm::MakoYmfm(int rate, std::vector<uint8_t> data) :
+	MakoFM(std::move(data)),
 	sample_rate(rate),
 	opna(*this)
 {
diff --git a/src/fm/mako_ymfm.h b/src/fm/mako_ymfm.h
index bc32a82..fb4ace0 100644
--- a/src/fm/mako_ymfm.h
+++ b/src/fm/mako_ymfm.h
@@ -1,12 +1,13 @@
 #ifndef MAKOYMFM_H_
 #define MAKOYMFM_H_
 
+#include <vector>
 #include "ymfm_opn.h"
 #include "makofm.h"
 
 class MakoYmfm : private MakoFM, private ymfm::ymfm_interface {
 public:
-	MakoYmfm(int rate, const uint8_t* data, bool free_data);
+	MakoYmfm(int rate, std::vector<uint8_t> data);
 	void Process(int16_t* stream, int len);
 	void get_mark(int* mark, int* loop);
 
diff --git a/src/fm/makofm.cpp b/src/fm/makofm.cpp
index c6174c5..4451943 100644
--- a/src/fm/makofm.cpp
+++ b/src/fm/makofm.cpp
@@ -43,9 +43,8 @@ const uint8_t PresetFMTone[TONE_DATA_SIZE] = {
 
 } // namespace
 
-MakoFM::MakoFM(const uint8_t* data, bool free_data) :
-	data(data),
-	free_data(free_data),
+MakoFM::MakoFM(std::vector<uint8_t> data) :
+	data(std::move(data)),
 	tone_offset(GetWord(0)),
 	ver(GetWord(2)) {
 	memset(work, 0, sizeof(work));
@@ -59,11 +58,6 @@ MakoFM::MakoFM(const uint8_t* data, bool free_data) :
 	}
 }
 
-MakoFM::~MakoFM() {
-	if (free_data)
-		free((void*)data);
-}
-
 void MakoFM::MainLoop() {
 	if (time_ms == 0.0) {
 		InitOPNA();
@@ -130,7 +124,7 @@ void MakoFM::ExecSequence(int ch, bool execcmd) {
 
  execcmd:
 	cmdFF = 0;
-	work[ch].seq_ptr = ExecCmd(ch, data + work[ch].seq_ptr) - data;
+	work[ch].seq_ptr = ExecCmd(ch, &data[work[ch].seq_ptr]) - data.data();
 	if (cmdFF) {
 		uint16_t block_addr = GetWord(work[ch].jump_ptr);
 		work[ch].jump_ptr += 2;
@@ -335,7 +329,7 @@ const uint8_t* MakoFM::ExecCmd(int ch, const uint8_t* code) {
 
 		case 0xf5:  // FM tone set
 			work[ch].tone_num = *code++;
-			SetFMTone(ch, data + tone_offset + TONE_DATA_SIZE * work[ch].tone_num);
+			SetFMTone(ch, &data[tone_offset + TONE_DATA_SIZE * work[ch].tone_num]);
 			ExecHWLFO(ch);
 			cont = true;
 			break;
diff --git a/src/fm/makofm.h b/src/fm/makofm.h
index 327db0b..fc3cda7 100644
--- a/src/fm/makofm.h
+++ b/src/fm/makofm.h
@@ -1,6 +1,7 @@
 #ifndef MAKOFM_H_
 #define MAKOFM_H_
 
+#include <vector>
 #include <stdint.h>
 
 const int MAKO_MAXCH = 9;
@@ -12,8 +13,7 @@ const int MAKO_MAXCH = 9;
 // [2] http://mydocuments.g2.xrea.com/html/p6/makop6.html
 class MakoFM {
 public:
-	MakoFM(const uint8_t* data, bool free_data);
-	~MakoFM();
+	explicit MakoFM(std::vector<uint8_t> data);
 	void MainLoop();
 
 	double GetTime() const { return time_ms; }
@@ -117,8 +117,7 @@ private:
 	};
 
 	Work work[9];
-	const uint8_t* data;
-	const bool free_data;
+	const std::vector<uint8_t> data;
 	uint16_t tone_offset;
 	uint16_t ver;
 
diff --git a/src/generic/mako.cpp b/src/generic/mako.cpp
index 175ab70..856539c 100644
--- a/src/generic/mako.cpp
+++ b/src/generic/mako.cpp
@@ -117,16 +117,14 @@ void MAKO::play_music(int page)
 			}
 		}
 	} else if (use_fm) {
-		DRI dri;
-		int size;
-		uint8* data = dri.load(amus, page, &size);
-		if (!data)
+		std::vector<uint8_t> data = dri_load(amus, page);
+		if (data.empty())
 			return;
 		if (!fm_mutex)
 			fm_mutex = SDL_CreateMutex();
 
 		SDL_LockMutex(fm_mutex);
-		fm = std::make_unique<MakoYmfm>(SAMPLE_RATE, data, true);
+		fm = std::make_unique<MakoYmfm>(SAMPLE_RATE, std::move(data));
 		SDL_UnlockMutex(fm_mutex);
 		Mix_HookMusic(&FMHook, this);
 	} else if (midi->is_available()) {
@@ -195,19 +193,18 @@ void MAKO::play_pcm(int page, bool loop)
 
 	stop_pcm();
 
-	uint8* buffer = NULL;
-	int size;
-	DRI* dri = new DRI();
-
-	if((buffer = dri->load("AWAV.DAT", page, &size)) != NULL) {
+	std::vector<uint8_t> buffer = dri_load("AWAV.DAT", page);
+	if (!buffer.empty()) {
 		// WAV形式 (Only You)
-		mix_chunk = Mix_LoadWAV_RW(SDL_RWFromConstMem(buffer, size), 1 /* freesrc */);
-		free(buffer);
+		mix_chunk = Mix_LoadWAV_RW(SDL_RWFromConstMem(buffer.data(), buffer.size()), 1 /* freesrc */);
 		Mix_PlayChannel(-1, mix_chunk, loop ? -1 : 0);
-	} else if((buffer = dri->load("AMSE.DAT", page, &size)) != NULL) {
+		return;
+	}
+	buffer = dri_load("AMSE.DAT", page);
+	if (!buffer.empty()) {
 		// AMSE形式 (乙女戦記)
-		int total = (size - 12) * 2 + 0x24;
-		int samples = (size - 12) * 2;
+		int samples = (buffer.size() - 12) * 2;
+		int total = samples + 0x24;
 
 		uint8* wav = (uint8*)malloc(total + 8);
 		memcpy(wav, header, 44);
@@ -219,11 +216,10 @@ void MAKO::play_pcm(int page, bool loop)
 		wav[41] = (samples >>  8) & 0xff;
 		wav[42] = (samples >> 16) & 0xff;
 		wav[43] = (samples >> 24) & 0xff;
-		for(int i = 12, p = 44; i < size; i++) {
+		for (size_t i = 12, p = 44; i < buffer.size(); i++) {
 			wav[p++] = buffer[i] & 0xf0;
 			wav[p++] = (buffer[i] & 0x0f) << 4;
 		}
-		free(buffer);
 
 		mix_chunk = Mix_LoadWAV_RW(SDL_RWFromConstMem(wav, total + 8), 1 /* freesrc */);
 		free(wav);
diff --git a/src/sys/ags_draw.cpp b/src/sys/ags_draw.cpp
index 5f356b5..90b5a0d 100644
--- a/src/sys/ags_draw.cpp
+++ b/src/sys/ags_draw.cpp
@@ -29,61 +29,56 @@ void AGS::load_cg(int page, int transparent)
 			return;
 		}
 	}
-	DRI* dri = new DRI();
-	int size;
-	uint8* data = dri->load(acg, page, &size);
-	if(data && size > 0) {
-		switch (nact->sys_ver) {
-		case 1:
-			switch (nact->crc32_a) {
-			case CRC32_BUNKASAI:
-			case CRC32_GAKUEN:
-			case CRC32_GAKUEN_ENG:
-				load_vsp(data, page, transparent);
-				break;
-			case CRC32_INTRUDER:
-				// load_gm3(data, page, transparent);
-				load_vsp(data, page, transparent);	// 暫定
-				break;
-			case CRC32_VAMPIRE:
-			case CRC32_VAMPIRE_ENG:
-				load_vsp2l(data, page, transparent);
-				break;
-			default:
-				load_gl3(data, page, transparent);
-				break;
-			}
+	std::vector<uint8_t> data = dri_load(acg, page);
+	if (data.empty())
+		return;
+	switch (nact->sys_ver) {
+	case 1:
+		switch (nact->crc32_a) {
+		case CRC32_BUNKASAI:
+		case CRC32_GAKUEN:
+		case CRC32_GAKUEN_ENG:
+			load_vsp(data.data(), page, transparent);
 			break;
-		case 2:
-			if(nact->crc32_a == CRC32_AYUMI_PROTO) {
-				// あゆみちゃん物語 PROTO
-				load_gl3(data, page, transparent);
-			} else if(nact->crc32_a == CRC32_AYUMI_FD || nact->crc32_a == CRC32_AYUMI_HINT) {
-				// あゆみちゃん物語
-				load_vsp(data, page, transparent);
-			} else if(nact->crc32_a == CRC32_SDPS) {
-				// Super D.P.S
-				load_pms(data, page, transparent);
-			} else {
-				if(data[0x8] == 0) {
-					load_vsp(data, page, transparent);
-				} else {
-					load_pms(data, page, transparent);
-				}
-			}
+		case CRC32_INTRUDER:
+			// load_gm3(data.data(), page, transparent);
+			load_vsp(data.data(), page, transparent);	// 暫定
 			break;
-		case 3:
-			if(data[0x8] == 0) {
-				load_vsp(data, page, transparent);
-			} else {
-				load_pms(data, page, transparent);
-			}
+		case CRC32_VAMPIRE:
+		case CRC32_VAMPIRE_ENG:
+			load_vsp2l(data.data(), page, transparent);
+			break;
+		default:
+			load_gl3(data.data(), page, transparent);
 			break;
 		}
+		break;
+	case 2:
+		if(nact->crc32_a == CRC32_AYUMI_PROTO) {
+			// あゆみちゃん物語 PROTO
+			load_gl3(data.data(), page, transparent);
+		} else if(nact->crc32_a == CRC32_AYUMI_FD || nact->crc32_a == CRC32_AYUMI_HINT) {
+			// あゆみちゃん物語
+			load_vsp(data.data(), page, transparent);
+		} else if(nact->crc32_a == CRC32_SDPS) {
+			// Super D.P.S
+			load_pms(data.data(), page, transparent);
+		} else {
+			if(data[0x8] == 0) {
+				load_vsp(data.data(), page, transparent);
+			} else {
+				load_pms(data.data(), page, transparent);
+			}
+		}
+		break;
+	case 3:
+		if(data[0x8] == 0) {
+			load_vsp(data.data(), page, transparent);
+		} else {
+			load_pms(data.data(), page, transparent);
+		}
+		break;
 	}
-	if (data)
-		free(data);
-	delete dri;
 }
 
 void AGS::copy(int sx, int sy, int ex, int ey, int dx, int dy)
diff --git a/src/sys/dri.cpp b/src/sys/dri.cpp
index 02ecf5d..7c4873f 100644
--- a/src/sys/dri.cpp
+++ b/src/sys/dri.cpp
@@ -9,7 +9,7 @@
 #include "crc32.h"
 #include "../fileio.h"
 
-uint8* DRI::load(const char* file_name, int page, int* size)
+std::vector<uint8> dri_load(const char* file_name, int page)
 {
 	char tmp_name[20];
 	strcpy_s(tmp_name, sizeof(tmp_name), file_name);
@@ -20,7 +20,7 @@ uint8* DRI::load(const char* file_name, int page, int* size)
 	tmp_name[0] = 'A';
 	if(!fio->Fopen(tmp_name, FILEIO_READ_BINARY)) {
 		delete fio;
-		return NULL;
+		return {};
 	}
 
 	int link_sector = fio->Fgetc();
@@ -32,7 +32,7 @@ uint8* DRI::load(const char* file_name, int page, int* size)
 		// ページ番号不正
 		fio->Fclose();
 		delete fio;
-		return NULL;
+		return {};
 	}
 
 	fio->Fseek((link_sector - 1) * 256 + (page - 1) * 2, FILEIO_SEEK_SET);
@@ -43,7 +43,7 @@ uint8* DRI::load(const char* file_name, int page, int* size)
 		// 欠番
 		fio->Fclose();
 		delete fio;
-		return NULL;
+		return {};
 	}
 
 	// A??.DAT以外にリンクされている場合はファイルを開き直す
@@ -52,7 +52,7 @@ uint8* DRI::load(const char* file_name, int page, int* size)
 		fio->Fclose();
 		if(!fio->Fopen(tmp_name, FILEIO_READ_BINARY)) {
 			delete fio;
-			return NULL;
+			return {};
 		}
 	}
 
@@ -63,16 +63,17 @@ uint8* DRI::load(const char* file_name, int page, int* size)
 	int end_sector = fio->Fgetc();
 	end_sector |= fio->Fgetc() << 8;
 
-	if((*size = (end_sector - start_sector) * 256) == 0) {
+	int size = (end_sector - start_sector) * 256;
+	if (size == 0) {
 		// サイズ不正
 		fio->Fclose();
 		delete fio;
-		return NULL;
+		return {};
 	}
 
-	uint8 *buffer = (uint8 *)malloc(*size);
+	std::vector<uint8_t> buffer(size);
 	fio->Fseek((start_sector - 1) * 256, FILEIO_SEEK_SET);
-	fio->Fread(buffer, 256, end_sector - start_sector);
+	fio->Fread(buffer.data(), 256, end_sector - start_sector);
 
 	fio->Fclose();
 	delete fio;
@@ -80,7 +81,7 @@ uint8* DRI::load(const char* file_name, int page, int* size)
 	return buffer;
 }
 
-uint8* DRI::load_mda(uint32 crc32_a, uint32 crc32_b, int page, int* size)
+std::vector<uint8> dri_load_mda(uint32_t crc32_a, uint32_t crc32_b, int page)
 {
 	// データ取得
 	const char* name = NULL;
@@ -195,12 +196,12 @@ uint8* DRI::load_mda(uint32 crc32_a, uint32 crc32_b, int page, int* size)
 	}
 
 	if(name == NULL) {
-		return NULL;
+		return {};
 	}
 
 	SDL_RWops* rw = open_resource(name, "mda");
 	if (!rw)
-		return NULL;
+		return {};
 	uint8 buf[4];
 
 	// ページの位置を取得
@@ -211,7 +212,7 @@ uint8* DRI::load_mda(uint32 crc32_a, uint32 crc32_b, int page, int* size)
 	if(page > (data_sector - link_sector) * 128 - 1) {
 		// ページ番号不正
 		SDL_RWclose(rw);
-		return NULL;
+		return {};
 	}
 
 	SDL_RWseek(rw, (link_sector - 1) * 256 + (page - 1) * 2, RW_SEEK_SET);
@@ -223,7 +224,7 @@ uint8* DRI::load_mda(uint32 crc32_a, uint32 crc32_b, int page, int* size)
 	if(disk_index == 0 || disk_index == 0x1a) {
 		// 欠番
 		SDL_RWclose(rw);
-		return NULL;
+		return {};
 	}
 
 	// AMUS.MDA以外にリンクされている場合はリソースを開き直す
@@ -271,10 +272,10 @@ uint8* DRI::load_mda(uint32 crc32_a, uint32 crc32_b, int page, int* size)
 				break;
 		}
 		if(name == NULL) {
-			return NULL;
+			return {};
 		}
 		if((rw = open_resource(name, "mda")) == NULL) {
-			return NULL;
+			return {};
 		}
 	} else if(disk_index == 3) {
 		SDL_RWclose(rw);
@@ -287,15 +288,15 @@ uint8* DRI::load_mda(uint32 crc32_a, uint32 crc32_b, int page, int* size)
 				break;
 		}
 		if(name == NULL) {
-			return NULL;
+			return {};
 		}
 		if((rw = open_resource(name, "mda")) == NULL) {
-			return NULL;
+			return {};
 		}
 	} else if(disk_index != 1) {
 		// AMUS.MDA以外にリンクされている場合は失敗
 		SDL_RWclose(rw);
-		return NULL;
+		return {};
 	}
 
 	// データ取得
@@ -304,14 +305,15 @@ uint8* DRI::load_mda(uint32 crc32_a, uint32 crc32_b, int page, int* size)
 	int start_sector = buf[0] | (buf[1] << 8);
 	int end_sector = buf[2] | (buf[3] << 8);
 
-	if((*size = (end_sector - start_sector) * 256) == 0) {
+	int size = (end_sector - start_sector) * 256;
+	if (size == 0) {
 		// サイズ不正
 		SDL_RWclose(rw);
-		return NULL;
+		return {};
 	}
-	uint8* buffer = (uint8*)malloc(*size);
+	std::vector<uint8_t> buffer(size);
 	SDL_RWseek(rw, (start_sector - 1) * 256, RW_SEEK_SET);
-	SDL_RWread(rw, buffer, *size, 1);
+	SDL_RWread(rw, buffer.data(), size, 1);
 
 	SDL_RWclose(rw);
 
diff --git a/src/sys/dri.h b/src/sys/dri.h
index efe8725..a2e814b 100644
--- a/src/sys/dri.h
+++ b/src/sys/dri.h
@@ -7,16 +7,10 @@
 #ifndef _DRI_H_
 #define _DRI_H_
 
-#include "../common.h"
+#include <stdint.h>
+#include <vector>
 
-class DRI
-{
-public:
-	DRI() {}
-	~DRI() {}
-
-	uint8* load(const char* file_name, int page, int* size);
-	uint8* load_mda(uint32 crc32_a, uint32 crc32_b, int page, int* size);
-};
+std::vector<uint8_t> dri_load(const char* file_name, int page);
+std::vector<uint8_t> dri_load_mda(uint32_t crc32_a, uint32_t crc32_b, int page);
 
 #endif
diff --git a/src/sys/mako_midi.cpp b/src/sys/mako_midi.cpp
index 2a6a329..9b3dba5 100644
--- a/src/sys/mako_midi.cpp
+++ b/src/sys/mako_midi.cpp
@@ -95,8 +95,8 @@ class Playback {
 public:
 	static std::unique_ptr<Playback> create(NACT* nact, char* amus, int page, int loop, int seq);
 	Playback(uint32_t crc32_a, int loop, int seq) : crc32_a(crc32_a), loop_(loop), seq_(seq) {}
-	bool load_mml(uint8_t* data, int size);
-	void load_mda(uint8_t* data, int size);
+	bool load_mml(const std::vector<uint8_t>& data);
+	void load_mda(const std::vector<uint8_t>& data);
 	void start_midi();
 	bool play_midi(SDL_atomic_t* current_loop, SDL_atomic_t* current_mark);
 	int seq() const { return seq_; }
@@ -382,32 +382,26 @@ bool Playback::play_midi(SDL_atomic_t* current_loop, SDL_atomic_t* current_mark)
 std::unique_ptr<Playback> Playback::create(NACT* nact, char* amus, int page, int loop, int seq)
 {
 	auto playback = std::make_unique<Playback>(nact->crc32_a, loop, seq);
-	auto dri = std::make_unique<DRI>();
 
-	int size;
-	uint8* data = dri->load(amus, page, &size);
-	if (!data)
+	std::vector<uint8_t> data = dri_load(amus, page);
+	if (data.empty())
 		return nullptr;
-	if (!playback->load_mml(data, size)) {
-		free(data);
+	if (!playback->load_mml(data))
 		return nullptr;
-	}
-	free(data);
 
 	// Load MDA
 	char path[16];
 	strcpy_s(path, 16, amus);
 	strcpy(path + strlen(path) - 3, "MDA");
-	data = dri->load(path, page, &size);
-	if (!data)
-		data = dri->load_mda(nact->crc32_a, nact->crc32_b, page, &size);
-	playback->load_mda(data, size);
-	free(data);
+	data = dri_load(path, page);
+	if (data.empty())
+		data = dri_load_mda(nact->crc32_a, nact->crc32_b, page);
+	playback->load_mda(data);
 
 	return playback;
 }
 
-bool Playback::load_mml(uint8_t* data, int size)
+bool Playback::load_mml(const std::vector<uint8_t>& data)
 {
 	// FM音源データの判定
 	int p, d0, d1, d2;
@@ -563,7 +557,7 @@ bool Playback::load_mml(uint8_t* data, int size)
 	return true;
 }
 
-void Playback::load_mda(uint8_t* data, int size)
+void Playback::load_mda(const std::vector<uint8_t>& data)
 {
 	// 未設定時の音色設定 (Piano, Acoustic Bass Drum)
 	for(int i = 0; i < 256 + 3; i++) {
@@ -582,7 +576,7 @@ void Playback::load_mda(uint8_t* data, int size)
 	}
 	tempo_dif = 0x40;
 
-	if (!data)
+	if (data.empty())
 		return;
 
 	tempo_dif = data[7];
@@ -592,7 +586,7 @@ void Playback::load_mda(uint8_t* data, int size)
 
 	// SSGパートの音色設定
 	for(int i = 0; i < 3; i++) {
-		uint8* buf = &data[map_wide * i + 27];
+		const uint8_t* buf = &data[map_wide * i + 27];
 		mda[i + 256].bank_select = buf[0];
 		mda[i + 256].program_change = buf[1];
 		mda[i + 256].level = buf[2];
@@ -604,7 +598,7 @@ void Playback::load_mda(uint8_t* data, int size)
 
 	// 通常の音色設定
 	for(int i = 0; i < inst_num; i++) {
-		uint8* buf = &data[27 + map_wide * 3 + (map_wide + 1) * i];
+		const uint8_t* buf = &data[27 + map_wide * 3 + (map_wide + 1) * i];
 		int n = buf[0];
 		mda[n].bank_select = buf[1];
 		mda[n].program_change = buf[2];
@@ -617,7 +611,7 @@ void Playback::load_mda(uint8_t* data, int size)
 
 	// ドラムパートの音色設定
 	if(drum_format) {
-		uint8* buf = &data[27 + map_wide * 3 + (map_wide + 1) * inst_num];
+		const uint8_t* buf = &data[27 + map_wide * 3 + (map_wide + 1) * inst_num];
 		int drum_num = buf[0];
 		for(int i = 0; i < drum_num; i++) {
 			int d = buf[i * 3 + 1];
diff --git a/src/sys/nact.cpp b/src/sys/nact.cpp
index 15334d2..265c603 100644
--- a/src/sys/nact.cpp
+++ b/src/sys/nact.cpp
@@ -59,7 +59,6 @@ NACT::NACT(int sys_ver, uint32 crc32_a, uint32 crc32_b, const Config& config)
 		strcpy_s(adisk, 16, "ADISK.DAT");
 
 	// シナリオ管理
-	scenario_data = NULL;
 	load_scenario(0);
 	scenario_page = 0;
 	scenario_addr = 2;
@@ -118,11 +117,6 @@ NACT::~NACT()
 	delete mako;
 	delete msgskip;
 
-	// シナリオ開放
-	if(scenario_data) {
-		free(scenario_data);
-	}
-
 	platform_finalize();
 }
 
@@ -160,7 +154,7 @@ EMSCRIPTEN_KEEPALIVE  // Prevent inlining, because this function is listed in AS
 void NACT::execute()
 {
 	// アドレスの確認
-	if(scenario_addr < 2 || scenario_addr >= scenario_size) {
+	if (scenario_addr < 2 || scenario_addr >= static_cast<int>(scenario_data.size())) {
 		fatal("Scenario error");
 		return;
 	}
@@ -320,7 +314,7 @@ void NACT::skip_string(uint8 terminator)
 	for (uint8 c = getd(); c != terminator; c = getd()) {
 		if (c != '\\')
 			ungetd();
-		scenario_addr += encoding->mblen(scenario_data + scenario_addr);
+		scenario_addr += encoding->mblen(&scenario_data[scenario_addr]);
 	}
 }
 
@@ -332,7 +326,7 @@ void NACT::get_string(char* buf, int size, uint8 terminator)
 	for (uint8 c = getd(); c != terminator; c = getd()) {
 		if (c != '\\')
 			ungetd();
-		int len = encoding->mblen(scenario_data + scenario_addr);
+		int len = encoding->mblen(&scenario_data[scenario_addr]);
 		if (i + len >= size)
 			fatal("String buffer overrun. page = %d, addr = %d", scenario_page, start_addr);
 		memcpy(&buf[i], &scenario_data[scenario_addr], len);
@@ -393,14 +387,10 @@ void NACT::text_wait()
 
 void NACT::load_scenario(int page)
 {
-	if(scenario_data) {
-		free(scenario_data);
-	}
-	DRI* dri = new DRI();
-	if((scenario_data = dri->load(adisk, page + 1, &scenario_size)) == NULL) {
+	scenario_data = dri_load(adisk, page + 1);
+	if (scenario_data.empty()) {
 		fatal("Cannot load scenario %d", page);
 	}
-	delete dri;
 }
 
 // 下位関数
diff --git a/src/sys/nact.h b/src/sys/nact.h
index 29b63e3..c87b66b 100644
--- a/src/sys/nact.h
+++ b/src/sys/nact.h
@@ -9,6 +9,7 @@
 
 #include <memory>
 #include <string>
+#include <vector>
 #include <stdio.h>
 #include "../common.h"
 #include "config.h"
@@ -114,8 +115,7 @@ protected:
 	char adisk[16];
 
 	// シナリオデータ
-	uint8* scenario_data;
-	int scenario_size;
+	std::vector<uint8_t> scenario_data;
 
 	// アドレス、ページ管理
 	int scenario_addr, prev_addr;
diff --git a/src/sys/nact_sys1.cpp b/src/sys/nact_sys1.cpp
index 5a2196b..aeb10e4 100644
--- a/src/sys/nact_sys1.cpp
+++ b/src/sys/nact_sys1.cpp
@@ -220,7 +220,7 @@ void NACT_Sys1::cmd_branch()
 				skip_string(cmd);
 			} else if (is_message(cmd)) {
 				ungetd();
-				scenario_addr += encoding->mblen(scenario_data + scenario_addr);
+				scenario_addr += encoding->mblen(&scenario_data[scenario_addr]);
 			} else if (cmd >= 0x20 && cmd < 0x7f) {
 				fatal("Unknown Command: '%c' at page = %d, addr = %d", cmd, scenario_page, prev_addr);
 			} else {
diff --git a/src/sys/nact_sys2.cpp b/src/sys/nact_sys2.cpp
index dc299d0..6b6460c 100644
--- a/src/sys/nact_sys2.cpp
+++ b/src/sys/nact_sys2.cpp
@@ -258,7 +258,7 @@ void NACT_Sys2::cmd_branch()
 				skip_string(cmd);
 			} else if (is_message(cmd)) {
 				ungetd();
-				scenario_addr += encoding->mblen(scenario_data + scenario_addr);
+				scenario_addr += encoding->mblen(&scenario_data[scenario_addr]);
 			} else if (cmd >= 0x20 && cmd < 0x7f) {
 				fatal("Unknown Command: '%c' at page = %d, addr = %d", cmd, scenario_page, prev_addr);
 			} else {
diff --git a/src/win/mako.cpp b/src/win/mako.cpp
index 9880ca5..62be19d 100644
--- a/src/win/mako.cpp
+++ b/src/win/mako.cpp
@@ -288,14 +288,12 @@ void MAKO::play_music(int page)
 			return;
 		music = new Music(playlist[track], next_loop);
 	} else if (use_fm) {
-		DRI dri;
-		int size;
-		uint8* data = dri.load(amus, page, &size);
-		if (!data)
+		std::vector<uint8_t> data = dri_load(amus, page);
+		if (data.empty())
 			return;
 
 		SDL_LockMutex(fm_mutex);
-		fm = std::make_unique<MakoYmfm>(SAMPLE_RATE, data, true);
+		fm = std::make_unique<MakoYmfm>(SAMPLE_RATE, std::move(data));
 		SDL_UnlockMutex(fm_mutex);
 		SDL_PauseAudio(0);
 	} else if (midi->is_available()) {
@@ -420,35 +418,32 @@ void MAKO::play_pcm(int page, bool loop)
 
 	stop_pcm();
 
-	uint8* buffer = NULL;
-	int size;
-	DRI* dri = new DRI();
+	// WAV形式 (Only You)
+	std::vector<uint8_t> wav_buffer = dri_load("AWAV.DAT", page);
+	if (wav_buffer.empty()) {
+		std::vector<uint8_t> buffer = dri_load("AMSE.DAT", page);
+		if (!buffer.empty()) {
+			// AMSE形式 (乙女戦記)
+			int samples = (static_cast<int>(buffer.size()) - 12) * 2;
+			int total = samples + 0x24;
 
-	if ((buffer = dri->load("AWAV.DAT", page, &size)) != NULL) {
-		// WAV形式 (Only You)
-		wav_buffer = buffer;
-	} else if ((buffer = dri->load("AMSE.DAT", page, &size)) != NULL) {
-		// AMSE形式 (乙女戦記)
-		int total = (size - 12) * 2 + 0x24;
-		int samples = (size - 12) * 2;
-
-		wav_buffer = (uint8*)malloc(total + 8);
-		memcpy(wav_buffer, header, 44);
-		wav_buffer[ 4] = (total >>  0) & 0xff;
-		wav_buffer[ 5] = (total >>  8) & 0xff;
-		wav_buffer[ 6] = (total >> 16) & 0xff;
-		wav_buffer[ 7] = (total >> 24) & 0xff;
-		wav_buffer[40] = (samples >>  0) & 0xff;
-		wav_buffer[41] = (samples >>  8) & 0xff;
-		wav_buffer[42] = (samples >> 16) & 0xff;
-		wav_buffer[43] = (samples >> 24) & 0xff;
-		for(int i = 12, p = 44; i < size; i++) {
-			wav_buffer[p++] = buffer[i] & 0xf0;
-			wav_buffer[p++] = (buffer[i] & 0x0f) << 4;
+			wav_buffer.resize(total + 8);
+			memcpy(wav_buffer.data(), header, 44);
+			wav_buffer[ 4] = (total >>  0) & 0xff;
+			wav_buffer[ 5] = (total >>  8) & 0xff;
+			wav_buffer[ 6] = (total >> 16) & 0xff;
+			wav_buffer[ 7] = (total >> 24) & 0xff;
+			wav_buffer[40] = (samples >>  0) & 0xff;
+			wav_buffer[41] = (samples >>  8) & 0xff;
+			wav_buffer[42] = (samples >> 16) & 0xff;
+			wav_buffer[43] = (samples >> 24) & 0xff;
+			for (size_t i = 12, p = 44; i < buffer.size(); i++) {
+				wav_buffer[p++] = buffer[i] & 0xf0;
+				wav_buffer[p++] = (buffer[i] & 0x0f) << 4;
+			}
 		}
-		free(buffer);
 	}
-	PlaySound((LPCTSTR)wav_buffer, NULL, SND_ASYNC | SND_MEMORY | (loop ? SND_LOOP : 0));
+	PlaySound((LPCTSTR)wav_buffer.data(), NULL, SND_ASYNC | SND_MEMORY | (loop ? SND_LOOP : 0));
 }
 
 void MAKO::stop_pcm()