diff --git a/CMakeLists.txt b/CMakeLists.txt
index 457f1b6..65d0cfd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -127,6 +127,8 @@ target_sources(xsystem4 PRIVATE
   src/hll/Confirm3.c
   src/hll/CrayfishLogViewer.c
   src/hll/Cursor.c
+  src/hll/DALKDemo.c
+  src/hll/DALKEDemo.c
   src/hll/Data.c
   src/hll/DataFile.c
   src/hll/DrawDungeon.c
diff --git a/src/ffi.c b/src/ffi.c
index 4699d50..fedc90c 100644
--- a/src/ffi.c
+++ b/src/ffi.c
@@ -320,6 +320,8 @@ extern struct static_library lib_Confirm2;
 extern struct static_library lib_Confirm3;
 extern struct static_library lib_CrayfishLogViewer;
 extern struct static_library lib_Cursor;
+extern struct static_library lib_DALKDemo;
+extern struct static_library lib_DALKEDemo;
 extern struct static_library lib_Data;
 extern struct static_library lib_DataFile;
 extern struct static_library lib_DrawDungeon;
@@ -417,6 +419,8 @@ static struct static_library *static_libraries[] = {
 	&lib_Confirm3,
 	&lib_CrayfishLogViewer,
 	&lib_Cursor,
+	&lib_DALKDemo,
+	&lib_DALKEDemo,
 	&lib_Data,
 	&lib_DataFile,
 	&lib_DrawDungeon,
diff --git a/src/hll/DALKDemo.c b/src/hll/DALKDemo.c
new file mode 100644
index 0000000..df6b82d
--- /dev/null
+++ b/src/hll/DALKDemo.c
@@ -0,0 +1,417 @@
+/* Copyright (C) 2024 kichikuou <KichikuouChrome@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "system4.h"
+#include "system4/alk.h"
+#include "system4/archive.h"
+#include "system4/cg.h"
+
+#include "audio.h"
+#include "effect.h"
+#include "gfx/gfx.h"
+#include "hll.h"
+#include "input.h"
+#include "vm.h"
+#include "xsystem4.h"
+
+#define NR_PARTICLES 30
+
+enum {
+	DD_CG_PARTICLE = 12,
+	DD_CG_LOGO = 13,
+	DD_CG_BACKGROUND = 14,
+	DD_CG_BACKGROUND_SHADOWED = 15,
+	DD_CG_MAGIC_CIRCLE = 16,
+	DD_CG_INITIALIZE_WARNING = 17,
+	DD_CG_YES = 18,
+	DD_CG_NO = 19,
+	DD_CG_GAMESTART = 20,
+	DD_CG_GAMESTART_SELECTED = 21,
+	DD_CG_INITIALIZE = 22,
+	DD_CG_INITIALIZE_SELECTED = 23,
+	DD_CG_MAX
+};
+
+enum {
+	DD_SOUND_SELCHANGE = 451,
+	DD_SOUND_CLICK = 454,
+};
+
+struct dalkdemo {
+	Texture tex[DD_CG_MAX];
+	Texture tmp;
+	float rotate_deg;
+	struct {
+		int x;
+		int y;
+		int speed;
+	} particles[NR_PARTICLES];
+};
+static struct dalkdemo *dd;
+
+static bool dalkdemo_run_effect(int (*update)(float), int time)
+{
+	uint32_t start = SDL_GetTicks();
+	bool prev_keydown = false;
+	uint32_t t = SDL_GetTicks() - start;
+	while (t < time) {
+		update((float)t / (float)time);
+		handle_events();
+		bool keydown = key_is_down(VK_LBUTTON) || key_is_down(VK_RBUTTON) || key_is_down(VK_RETURN) || key_is_down(VK_SPACE);
+		if (prev_keydown && !keydown)
+			return true;
+		prev_keydown = keydown;
+
+		uint32_t t2 = SDL_GetTicks() - start;
+		if (t2 < t + 16) {
+			SDL_Delay(t + 16 - t2);
+			t += 16;
+		} else {
+			t = t2;
+		}
+	}
+	return false;
+}
+
+static bool dalkdemo_effect_copy(Texture *tex, int x, int y, int w, int h, enum effect effect, int time)
+{
+	if (!effect_init(effect))
+		return true;
+	effect_record_old();
+	if (tex)
+		gfx_copy(gfx_main_surface(), x, y, tex, x, y, w, h);
+	else
+		gfx_clear();
+	effect_record_new();
+
+	bool interrupted = dalkdemo_run_effect(effect_update, time);
+	if (!interrupted)
+		effect_update(1.0);
+	effect_fini();
+	return interrupted;
+}
+
+static bool dalkdemo_wait(int time)
+{
+	return dalkdemo_effect_copy(&dd->tex[0], 0, 0, 0, 0, EFFECT_CROSSFADE, time);
+}
+
+static void dalkdemo_draw_title(Texture *dst, float circle_mag, float logo_opacity)
+{
+	Texture *src = &dd->tex[DD_CG_MAGIC_CIRCLE];
+	gfx_copy_rot_zoom2(dst, dst->w / 2, dst->h / 2, src, src->w / 2, src->h / 2, dd->rotate_deg, circle_mag);
+	dd->rotate_deg -= 0.25f;
+
+	if (logo_opacity <= 0.f) {
+		src = &dd->tex[DD_CG_BACKGROUND];
+	} else if (logo_opacity >= 1.f) {
+		src = &dd->tex[DD_CG_BACKGROUND_SHADOWED];
+	} else {
+		src = &dd->tex[DD_CG_BACKGROUND];
+		gfx_copy(&dd->tmp, 0, 0, src, 0, 0, src->w, src->h);
+		src = &dd->tex[DD_CG_BACKGROUND_SHADOWED];
+		gfx_blend(&dd->tmp, 0, 0, src, 0, 0, src->w, src->h, logo_opacity * 255);
+		src = &dd->tmp;
+	}
+	gfx_blend_screen(dst, 0, 0, src, 0, 0, src->w, src->h);
+
+	src = &dd->tex[DD_CG_LOGO];
+	gfx_blend_amap_alpha(dst, 0, 0, src, 0, 0, src->w, src->h, logo_opacity * 255);
+
+	src = &dd->tex[DD_CG_PARTICLE];
+	for (int i = 0; i < NR_PARTICLES; i++) {
+		gfx_blend_screen(dst, dd->particles[i].x - src->w / 2, dd->particles[i].y - src->h / 2, src, 0, 0, src->w, src->h);
+		dd->particles[i].x = (dd->particles[i].x - dd->particles[i].speed + dst->w) % dst->w;
+		dd->particles[i].y = (dd->particles[i].y + dd->particles[i].speed) % dst->h;
+	}
+}
+
+static int dalkdemo_title_effect(float progress)
+{
+	float t = progress * 15.f;
+	gfx_clear();
+	float logo_opacity = max(0.f, min(1.f, (t - 5.f) / 7.f));
+	dalkdemo_draw_title(gfx_main_surface(), 1.75f - t * 0.05f, logo_opacity);
+	if (t < 5.f) {
+		int b = t * 255 / 5;
+		gfx_fill_multiply(gfx_main_surface(), 0, 0, 640, 480, b, b, b);
+	}
+	gfx_swap();
+	return 1;
+}
+
+static void dalkdemo_intro(void)
+{
+	int bgm_channel = bgm_get_unused_channel();
+	bgm_prepare(bgm_channel, 1);
+	bgm_play(bgm_channel);
+
+	gfx_clear();
+	if (dalkdemo_effect_copy(&dd->tex[0], 0, 0, 640, 480, EFFECT_CROSSFADE, 1500))
+		goto skipped;
+	if (dalkdemo_wait(1000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[1], 0, 0, 640, 480, EFFECT_CROSSFADE, 1500))
+		goto skipped;
+	// FIXME: DALKDemo.dll uses a steeper gradient
+	if (dalkdemo_effect_copy(&dd->tex[2], 585, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[2], 545, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[2], 505, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[2], 60, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[2], 20, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+
+	if (dalkdemo_effect_copy(&dd->tex[0], 0, 0, 640, 480, EFFECT_CROSSFADE, 4000))
+		goto skipped;
+	if (dalkdemo_wait(1000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[3], 340, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[3], 300, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[3], 260, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[0], 0, 0, 640, 480, EFFECT_CROSSFADE, 3000))
+		goto skipped;
+
+	if (dalkdemo_effect_copy(&dd->tex[4], 0, 0, 640, 480, EFFECT_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[5], 190, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[5], 150, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[5], 110, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[5], 70, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[5], 30, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+
+	if (dalkdemo_effect_copy(&dd->tex[0], 0, 0, 640, 480, EFFECT_CROSSFADE, 4000))
+		goto skipped;
+	if (dalkdemo_wait(1000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[6], 320, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[6], 280, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[0], 0, 0, 640, 480, EFFECT_CROSSFADE, 3000))
+		goto skipped;
+
+	if (dalkdemo_effect_copy(&dd->tex[7], 0, 0, 640, 480, EFFECT_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[8], 560, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[8], 520, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[8], 480, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[8], 440, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[8], 400, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+
+	if (dalkdemo_effect_copy(&dd->tex[0], 0, 0, 640, 480, EFFECT_CROSSFADE, 4000))
+		goto skipped;
+	if (dalkdemo_wait(1000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[9], 360, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[9], 320, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[9], 280, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[9], 240, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[0], 0, 0, 640, 480, EFFECT_CROSSFADE, 3000))
+		goto skipped;
+
+	if (dalkdemo_effect_copy(&dd->tex[10], 0, 0, 640, 480, EFFECT_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[11], 580, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[11], 540, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(&dd->tex[11], 60, 0, 40, 480, EFFECT_UP_DOWN_CROSSFADE, 3000))
+		goto skipped;
+	if (dalkdemo_effect_copy(NULL, 0, 0, 640, 480, EFFECT_CROSSFADE, 3000))
+		goto skipped;
+
+	dalkdemo_run_effect(dalkdemo_title_effect, 15000);
+
+ skipped:
+	bgm_unprepare(bgm_channel);
+}
+
+static int dalkdemo_main_menu()
+{
+	Texture *dst = gfx_main_surface();
+
+	enum {
+		START_MENU,
+		INITIALIZE_MENU,
+	} state = START_MENU;
+
+	bool sel = false;
+	bool prev_lbutton = false;
+	bool prev_rbutton = false;
+	for (;;) {
+		// Input handling
+		handle_events();
+		int mx, my;
+		mouse_get_pos(&mx, &my);
+		bool next_sel = state == START_MENU ? my >= 430 : mx >= 320;
+		if (sel != next_sel) {
+			sel = next_sel;
+			audio_play_sound(DD_SOUND_SELCHANGE);
+		}
+
+		bool lbutton = key_is_down(VK_LBUTTON);
+		if (prev_lbutton && !lbutton) {
+			audio_play_sound(DD_SOUND_CLICK);
+			if (state == START_MENU) {
+				if (!sel)
+					return 1;
+				else
+					state = INITIALIZE_MENU;
+			} else {
+				if (!sel)
+					return 2;
+				else
+					state = START_MENU;
+			}
+		}
+		prev_lbutton = lbutton;
+		bool rbutton = key_is_down(VK_RBUTTON);
+		if (prev_rbutton && !rbutton && state == INITIALIZE_MENU) {
+			state = START_MENU;
+		}
+		prev_rbutton = rbutton;
+
+		// Draw
+		gfx_clear();
+		dalkdemo_draw_title(dst, 1.f, 1.f);
+
+		if (state == START_MENU) {
+			Texture *src = &dd->tex[!sel ? DD_CG_GAMESTART_SELECTED : DD_CG_GAMESTART];
+			gfx_blend_amap(dst, (dst->w - src->w) / 2, 412 - src->h, src, 0, 0, src->w, src->h);
+			src = &dd->tex[sel ? DD_CG_INITIALIZE_SELECTED : DD_CG_INITIALIZE];
+			gfx_blend_amap(dst, (dst->w - src->w) / 2, 473 - src->h, src, 0, 0, src->w, src->h);
+		} else {
+			gfx_copy_grayscale(dst, 0, 0, dst, 0, 0, dst->w, dst->h);
+			Texture *src = &dd->tex[DD_CG_INITIALIZE_WARNING];
+			gfx_blend_amap(dst, 0, dst->h - src->h, src, 0, 0, src->w, src->h);
+			if (!sel) {
+				src = &dd->tex[DD_CG_YES];
+				gfx_blend_amap(dst, 223, dst->h - src->h, src, 0, 0, src->w, src->h);
+			} else {
+				src = &dd->tex[DD_CG_NO];
+				gfx_blend_amap(dst, 330, dst->h - src->h, src, 0, 0, src->w, src->h);
+			}
+		}
+
+		gfx_swap();
+		audio_update();
+		vm_sleep(16);
+	}
+}
+
+static void DALKDemo_Release(void)
+{
+	for (int i = 0; i < DD_CG_MAX; i++) {
+		gfx_delete_texture(&dd->tex[i]);
+	}
+	gfx_delete_texture(&dd->tmp);
+	free(dd);
+	dd = NULL;
+}
+
+static int DALKDemo_Init(possibly_unused void *imainsystem)
+{
+	char *alk_path = gamedir_path("daDemo.alk");
+	int error = ARCHIVE_SUCCESS;
+	struct alk_archive *alk = alk_open(alk_path, MMAP_IF_64BIT, &error);
+	if (error == ARCHIVE_FILE_ERROR) {
+		WARNING("%s: %s", display_utf0(alk_path), strerror(errno));
+	} else if (error == ARCHIVE_BAD_ARCHIVE_ERROR) {
+		WARNING("%s: invalid .alk file", display_utf0(alk_path));
+	}
+	free(alk_path);
+	if (!alk)
+		return 0;
+
+	dd = xcalloc(1, sizeof(struct dalkdemo));
+	for (int i = 0; i < DD_CG_MAX; i++) {
+		struct archive_data *dfile = archive_get(&alk->ar, i);
+		if (!dfile) {
+			WARNING("daDemo.alk: cannot load CG %d", i);
+			DALKDemo_Release();
+			return 0;
+		}
+		struct cg *cg = cg_load_data(dfile);
+		archive_free_data(dfile);
+		if (!cg) {
+			WARNING("daDemo.alk: cannot decode CG %d", i);
+			DALKDemo_Release();
+			return 0;
+		}
+		gfx_init_texture_with_cg(&dd->tex[i], cg);
+		cg_free(cg);
+	}
+	archive_free(&alk->ar);
+	gfx_init_texture_blank(&dd->tmp, 640, 480);
+
+	dd->rotate_deg = 0.f;
+	for (int i = 0; i < NR_PARTICLES; i++) {
+		dd->particles[i].x = rand() % 640;
+		dd->particles[i].y = rand() % 480;
+		dd->particles[i].speed = rand() % 2 ? 1 : 2;
+	}
+
+	return 1;
+}
+
+static int DALKDemo_Run(void)
+{
+	if (!dd)
+		return 0;
+
+	dalkdemo_intro();
+	return dalkdemo_main_menu();
+}
+
+static int DALKDemo_Run2(void)
+{
+	if (!dd)
+		return 0;
+
+	return dalkdemo_main_menu();
+}
+
+HLL_LIBRARY(DALKDemo,
+	    HLL_EXPORT(Init, DALKDemo_Init),
+	    HLL_EXPORT(Run, DALKDemo_Run),
+	    HLL_EXPORT(Run2, DALKDemo_Run2),
+	    HLL_EXPORT(Release, DALKDemo_Release)
+	    );
diff --git a/src/hll/DALKEDemo.c b/src/hll/DALKEDemo.c
new file mode 100644
index 0000000..f057fda
--- /dev/null
+++ b/src/hll/DALKEDemo.c
@@ -0,0 +1,27 @@
+/* Copyright (C) 2024 kichikuou <KichikuouChrome@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://gnu.org/licenses/>.
+ */
+
+#include "hll.h"
+
+HLL_WARN_UNIMPLEMENTED(0, int, DALKEDemo, Init, void *pIMainSystem);
+//void DALKEDemo_SetKeyCancelFlag(int nCencel);
+//int DALKEDemo_Run(void);
+
+HLL_LIBRARY(DALKEDemo,
+	    HLL_EXPORT(Init, DALKEDemo_Init),
+	    HLL_TODO_EXPORT(SetKeyCancelFlag, DALKEDemo_SetKeyCancelFlag),
+	    HLL_TODO_EXPORT(Run, DALKEDemo_Run)
+	    );
diff --git a/src/meson.build b/src/meson.build
index 6e64e81..019fd93 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -81,6 +81,8 @@ xsystem4 = [version_h,
             'hll/Confirm3.c',
             'hll/CrayfishLogViewer.c',
             'hll/Cursor.c',
+            'hll/DALKDemo.c',
+            'hll/DALKEDemo.c',
             'hll/Data.c',
             'hll/DataFile.c',
             'hll/DrawDungeon.c',