diff --git a/modules/CMakeLists.txt b/modules/CMakeLists.txt
index f100457..954b168 100644
--- a/modules/CMakeLists.txt
+++ b/modules/CMakeLists.txt
@@ -15,7 +15,6 @@ add_library(modules STATIC
   MsgSkip/MsgSkip.c
   NIGHTDLL/NIGHTDLL.c
   NIGHTDLL/nt_scenario.c
-  NIGHTDLL/sactcg.c
   NIGHTDLL/sactstring.c
   NIGHTDLL/sprite.c
   NIGHTDLL/sprite_draw.c
@@ -30,7 +29,6 @@ add_library(modules STATIC
   RandMT/RandMT.c
   S3xMusic/S3xMusic.c
   SACT/SACT.c
-  SACT/sactcg.c
   SACT/sactsound.c
   SACT/sacttimer.c
   SACT/sactstring.c
@@ -68,6 +66,7 @@ add_library(modules STATIC
   lib/drawtext.c
   lib/list.c
   lib/graph_blend_amap.c
+  lib/sactcg.c
   nDEMO/nDEMO.c
   nDEMOE/nDEMOE.c
   oDEMO/oDEMO.c
diff --git a/modules/NIGHTDLL/NIGHTDLL.c b/modules/NIGHTDLL/NIGHTDLL.c
index b7057f1..435fa7c 100644
--- a/modules/NIGHTDLL/NIGHTDLL.c
+++ b/modules/NIGHTDLL/NIGHTDLL.c
@@ -46,7 +46,7 @@ static void NIGHTDLL_reset(void) {
 		if (night.sp[i])
 			nt_sp_free(night.sp[i]);
 	}
-	nt_scg_freeall();
+	scg_freeall();
 	memset(&night, 0, sizeof(night));
 }
 
diff --git a/modules/NIGHTDLL/night.h b/modules/NIGHTDLL/night.h
index a6b8963..6874c5c 100644
--- a/modules/NIGHTDLL/night.h
+++ b/modules/NIGHTDLL/night.h
@@ -37,10 +37,6 @@ struct _night {
 	int waitskiplv;
 	int waitkey;
 
-	
-	// graph
-	// cginfo_t *cg[CGMAX];
-
 	SDL_Rect updaterect;
 
 	FontType fonttype;
diff --git a/modules/NIGHTDLL/nt_msg.c b/modules/NIGHTDLL/nt_msg.c
index 5e626fb..9ec18be 100644
--- a/modules/NIGHTDLL/nt_msg.c
+++ b/modules/NIGHTDLL/nt_msg.c
@@ -82,7 +82,7 @@ void ntmsg_init() {
 	nt_sp_add_updatelist(sp);
 	
 	// 文字背景CG作成
-	nt_scg_create(CGNO_MSGFR_BG,
+	scg_create(CGNO_MSGFR_BG,
 		   main_surface->w, main_surface->h,
 		   0, 0, 0, 255);
 	// night.cg[CGNO_MSGFR_BG]->refcnt++;
@@ -92,9 +92,9 @@ void ntmsg_init() {
 	nt_sp_add_updatelist(sp);
 	
 	// キー入力アニメーションCG作成
-	nt_scg_cut(CGNO_MSGHAK_1, CGNO_MSGHAK_LCG, 0, 0, 9, 9);
+	scg_cut(CGNO_MSGHAK_1, CGNO_MSGHAK_LCG, 0, 0, 9, 9);
 	//night.cg[CGNO_MSGHAK_1]->refcnt++;
-	nt_scg_cut(CGNO_MSGHAK_2, CGNO_MSGHAK_LCG, 0, 9, 9, 9);
+	scg_cut(CGNO_MSGHAK_2, CGNO_MSGHAK_LCG, 0, 9, 9, 9);
 	//night.cg[CGNO_MSGHAK_2]->refcnt++;
 	sp = night.sp[SPNO_MSG_KEYANIM] = nt_sp_new(SPNO_MSG_KEYANIM, CGNO_MSGHAK_1, CGNO_MSGHAK_2, 0, SPRITE_ANIME);
 	sp->u.anime.interval = HAKANIM_INTERVAL;
diff --git a/modules/NIGHTDLL/sactcg.c b/modules/NIGHTDLL/sactcg.c
deleted file mode 100644
index f0e4595..0000000
--- a/modules/NIGHTDLL/sactcg.c
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
- * sactcg.c: CG作成
- *
- * Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
- *               1998-                           <masaki-c@is.aist-nara.ac.jp>
- *
- * 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
-*/
-/* $Id: sactcg.c,v 1.2 2003/11/16 15:29:52 chikama Exp $ */
-
-#include "config.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <SDL.h>
-
-#include "portab.h"
-#include "nact.h"
-#include "system.h"
-#include "ags.h"
-#include "cg.h"
-#include "sactcg.h"
-
-#define CGMAX 65536
-static cginfo_t *cgs[CGMAX];
-
-#define SPCG_ASSERT_NO(no) \
-  if ((no) > (CGMAX -1)) { \
-    WARNING("no is too large (should be %d < %d)", (no), CGMAX); \
-    return; \
-  } \
-
-static cginfo_t *nt_scg_new(enum cgtype type, int no, SDL_Surface *sf) {
-	cginfo_t *info = calloc(1, sizeof(cginfo_t));
-	info->type = type;
-	info->no = no;
-	info->sf = sf;
-	info->refcnt = 1;
-
-	nt_scg_free(no);
-	cgs[no] = info;
-
-	return info;
-}
-
-/*
-  cgの読み込み
-
-    指定の番号のCGをリンクファイルから読み込んだり、
-    CG_xxxで作成したCGを参照する
-    
-  @param no: 読み込むCG番号
-*/
-static cginfo_t *nt_scg_get(int no) {
-	if (no >= (CGMAX -1)) {
-		WARNING("no is too large (should be %d < %d)", (no), CGMAX);
-		return NULL;
-	}
-	
-	if (cgs[no] != NULL)
-		return cgs[no];
-
-	SDL_Surface *sf = cg_load_as_sdlsurface(no - 1);
-	if (!sf) {
-		WARNING("load fail (%d)", no -1);
-		return NULL;
-	}
-	return nt_scg_new(CG_LINKED, no, sf);
-}
-
-cginfo_t *nt_scg_addref(int no) {
-	cginfo_t *info = nt_scg_get(no);
-	if (info)
-		info->refcnt++;
-	return info;
-}
-
-void nt_scg_deref(cginfo_t *cg) {
-	if (--cg->refcnt > 0)
-		return;
-
-	if (cg->sf)
-		SDL_FreeSurface(cg->sf);
-	free(cg);
-}
-
-//  指定の大きさ、色の矩形の CG を作成
-void nt_scg_create(int wNumCG, int wWidth, int wHeight, int wR, int wG, int wB, int wBlendRate) {
-	SPCG_ASSERT_NO(wNumCG);
-
-	SDL_Surface *sf = SDL_CreateRGBSurfaceWithFormat(0, wWidth, wHeight, 32, SDL_PIXELFORMAT_ARGB8888);
-	SDL_FillRect(sf, NULL, SDL_MapRGBA(sf->format, wR, wG, wB, wBlendRate));
-	nt_scg_new(CG_SET, wNumCG, sf);
-}
-
-// CGの一部を切りぬいたCGを作成
-void nt_scg_cut(int wNumDstCG, int wNumSrcCG, int wX, int wY, int wWidth, int wHeight) {
-	SPCG_ASSERT_NO(wNumDstCG);
-	SPCG_ASSERT_NO(wNumSrcCG);
-
-	cginfo_t *src = nt_scg_get(wNumSrcCG);
-	if (!src)
-		return;
-
-	SDL_Surface *sf = SDL_CreateRGBSurfaceWithFormat(0, wWidth, wHeight, src->sf->format->BitsPerPixel, src->sf->format->format);
-	SDL_BlitSurface(src->sf, &(SDL_Rect){wX, wY, wWidth, wHeight}, sf, NULL);
-
-	nt_scg_new(CG_SET, wNumDstCG, sf);
-}
-
-// 全てのCGの開放
-void nt_scg_freeall(void) {
-	int i;
-	
-	for (i = 1; i < CGMAX; i++) {
-		nt_scg_free(i);
-	}
-}
-
-/**
- * 指定の番号の CG をオブジェクトリストから消し、オブジェクトがどこからも参照
- * されていない(参照数が0の)場合のみ、オブジェクトを削除
- */
-void nt_scg_free(int no) {
-	SPCG_ASSERT_NO(no);
-	
-	cginfo_t *cg = cgs[no];
-	if (!cg) return;
-	
-	nt_scg_deref(cg);
-	cgs[no] = NULL;
-}
diff --git a/modules/NIGHTDLL/sactcg.h b/modules/NIGHTDLL/sactcg.h
deleted file mode 100644
index 05a7164..0000000
--- a/modules/NIGHTDLL/sactcg.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/*
- * sactcg.h: CG作成
- *
- * Copyright (C) 1997-1998 Masaki Chikama (Wren) <chikama@kasumi.ipl.mech.nagoya-u.ac.jp>
- *               1998-                           <masaki-c@is.aist-nara.ac.jp>
- *
- * 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
-*/
-/* $Id: sactcg.h,v 1.2 2003/11/16 15:29:52 chikama Exp $ */
-
-#ifndef __SACTCG_H__
-#define __SACTCG_H__
-
-#include "portab.h"
-#include "night.h"
-
-cginfo_t *nt_scg_addref(int no);
-void nt_scg_deref(cginfo_t *cg);
-void nt_scg_create(int wNumCG, int wWidth, int wHeight, int wR, int wG, int wB, int wBlendRate);
-void nt_scg_cut(int wNumDstCG, int wNumSrcCG, int wX, int wY, int wWidth, int wHeight);
-void nt_scg_freeall(void);
-void nt_scg_free(int cg);
-
-#endif
diff --git a/modules/NIGHTDLL/sprite.c b/modules/NIGHTDLL/sprite.c
index 34ec5c3..abd621a 100644
--- a/modules/NIGHTDLL/sprite.c
+++ b/modules/NIGHTDLL/sprite.c
@@ -16,9 +16,9 @@ sprite_t *nt_sp_new(int no, int cg1, int cg2, int cg3, int type) {
 	sp->no = no;
 	sp->type = type;
 	
-	sp->cg1 = cg1 ? nt_scg_addref(cg1) : NULL;
-	sp->cg2 = cg2 ? nt_scg_addref(cg2) : NULL;
-	sp->cg3 = cg3 ? nt_scg_addref(cg3) : NULL;
+	sp->cg1 = cg1 ? scg_addref(cg1) : NULL;
+	sp->cg2 = cg2 ? scg_addref(cg2) : NULL;
+	sp->cg3 = cg3 ? scg_addref(cg3) : NULL;
 	
 	sp->curcg = sp->cg1;
 	sp->show = true;
@@ -71,9 +71,9 @@ sprite_t *nt_sp_msg_new(int no, int x, int y, int width, int height) {
 void nt_sp_free(sprite_t *sp) {
 	if (sp == NULL) return;
 	
-	if (sp->cg1) nt_scg_deref(sp->cg1);
-	if (sp->cg2) nt_scg_deref(sp->cg2);
-	if (sp->cg3) nt_scg_deref(sp->cg3);
+	if (sp->cg1) scg_deref(sp->cg1);
+	if (sp->cg2) scg_deref(sp->cg2);
+	if (sp->cg3) scg_deref(sp->cg3);
 
 	if (sp->type == SPRITE_MSG) {
 		SDL_FreeSurface(sp->u.msg.canvas);
@@ -102,9 +102,9 @@ void nt_sp_set_cg(sprite_t *sp, int no) {
 	if (sp == NULL) return;
 
 	if (sp->curcg)
-		nt_scg_deref(sp->curcg);
+		scg_deref(sp->curcg);
 
-	cg = no ? nt_scg_addref(no) : NULL;
+	cg = no ? scg_addref(no) : NULL;
 	
 	if (cg == NULL) {
 		sp->width  = 0;
diff --git a/modules/NIGHTDLL/sprite.h b/modules/NIGHTDLL/sprite.h
index 4b74096..eb80d28 100644
--- a/modules/NIGHTDLL/sprite.h
+++ b/modules/NIGHTDLL/sprite.h
@@ -4,6 +4,7 @@
 
 #include "portab.h"
 #include <SDL_rect.h>
+#include "sactcg.h"
 
 #define DEFAULT_UPDATE nt_sp_draw
 
@@ -21,7 +22,6 @@
 #define SPNO_MSG_KEYANIM 12 // メッセージキー入力アニメーション
 #define SPNO_MSG_ICON_MUTE 13 // メッセージウィンドアイコン
 
-#define CGMAX 65536
 // 0-9999: reserve for Link CG
 // 2051: メッセージウィンド枠CG
 #define CGNO_MSGFRAME_LCG 2051
@@ -40,25 +40,6 @@
 #define CGNO_MSGFR_BG 10002
 
 
-// CG_XX で作るCGの種類
-enum cgtype {
-	CG_NOTUSED = 0,
-	CG_LINKED  = 1,
-	CG_SET     = 2,
-	CG_REVERSE = 3,
-	CG_STRETCH = 4
-};
-
-// cgに関する情報
-struct _cginfo {
-	enum cgtype type;  // CGの種類, 0: 未使用, 1:リンクされている, ...
-	int no;            // CGの番号
-	struct SDL_Surface *sf;
-	int refcnt;        // 参照カウンタ。０になったら開放してもよい。
-};
-typedef struct _cginfo cginfo_t;
-
-
 enum spritetype {
 	SPRITE_NORMAL = 0,
 	SPRITE_ANIME  = 5,
diff --git a/modules/SACT/sact.h b/modules/SACT/sact.h
index 564eb39..390726a 100644
--- a/modules/SACT/sact.h
+++ b/modules/SACT/sact.h
@@ -30,14 +30,11 @@
 #include "list.h"
 #include "ags.h"
 #include "sacttimer.h"
-#include "variable.h"
+#include "sactcg.h"
 
 // スプライトの最大数
 #define SPRITEMAX 21845
 
-// CGの最大数
-#define CGMAX 63336
-
 // メッセージの最大長さ
 #define MSGBUFMAX 257*10
 
@@ -59,24 +56,6 @@ typedef struct {
 	char *dst; // 置き換え文字列
 } strexchange_t;
 
-// CG_XX で作るCGの種類
-enum cgtype {
-	CG_NOTUSED = 0,
-	CG_LINKED  = 1,
-	CG_SET     = 2,
-	CG_REVERSE = 3,
-	CG_STRETCH = 4
-};
-
-// cgに関する情報
-struct _cginfo {
-	enum cgtype type;  // CGの種類, 0: 未使用, 1:リンクされている, ...
-	int no;            // CGの番号
-	struct SDL_Surface *sf;
-	int refcnt;        // 参照カウンタ。０になったら開放してもよい。
-};
-typedef struct _cginfo cginfo_t;
-
 // スプライトのタイプ
 enum spritetype {
 	SPRITE_NORMAL = 0,
@@ -209,9 +188,7 @@ struct _sact {
 	SList *sp_quake;  // Quakeで揺らすスプライトのリスト
 	
 	SList *updatelist; // 再描画するスプライトのリスト
-	
-	cginfo_t *cg[CGMAX]; // cgまたはCG_xxで作った CG
-	
+
 	// 座標系の原点
 	SDL_Point origin;
 	
diff --git a/modules/SACT/sprite_msg.c b/modules/SACT/sprite_msg.c
index 7d8b9c8..45fc692 100644
--- a/modules/SACT/sprite_msg.c
+++ b/modules/SACT/sprite_msg.c
@@ -31,6 +31,7 @@
 #include "system.h"
 #include "ags.h"
 #include "nact.h"
+#include "variable.h"
 #include "input.h"
 #include "sact.h"
 #include "sprite.h"
diff --git a/modules/SACT/sprite_sel.c b/modules/SACT/sprite_sel.c
index e9127a2..8a0d337 100644
--- a/modules/SACT/sprite_sel.c
+++ b/modules/SACT/sprite_sel.c
@@ -30,6 +30,7 @@
 
 #include "portab.h"
 #include "nact.h"
+#include "variable.h"
 #include "ags.h"
 #include "input.h"
 #include "sact.h"
diff --git a/modules/SACT/sactcg.c b/modules/lib/sactcg.c
similarity index 89%
rename from modules/SACT/sactcg.c
rename to modules/lib/sactcg.c
index 1aa3f05..e5d7f8b 100644
--- a/modules/SACT/sactcg.c
+++ b/modules/lib/sactcg.c
@@ -33,26 +33,35 @@
 #include "nact.h"
 #include "system.h"
 #include "ags.h"
-#include "sact.h"
+#include "variable.h"
 #include "sactcg.h"
 #include "cg.h"
 #include "gfx.h"
 
+#define CGMAX 65536
+static cginfo_t **cg_store;
+
 #define SPCG_ASSERT_NO(no) \
   if ((no) > (CGMAX -1)) { \
     WARNING("no is too large (should be %d < %d)", (no), CGMAX); \
     return; \
   } \
 
-static cginfo_t *scg_new(enum cgtype type, int no, SDL_Surface *sf) {
+static void scg_ensure_store(void) {
+	if (!cg_store)
+		cg_store = calloc(CGMAX, sizeof(cginfo_t *));
+}
+
+static cginfo_t *scg_new(enum sactcg_type type, int no, SDL_Surface *sf) {
 	cginfo_t *info = calloc(1, sizeof(cginfo_t));
 	info->type = type;
 	info->no = no;
 	info->sf = sf;
 	info->refcnt = 1;
 
+	scg_ensure_store();
 	scg_free(no);
-	sact.cg[no] = info;
+	cg_store[no] = info;
 
 	return info;
 }
@@ -71,8 +80,8 @@ static cginfo_t *scg_get(int no) {
 		return NULL;
 	}
 	
-	if (sact.cg[no] != NULL)
-		return sact.cg[no];
+	if (cg_store && cg_store[no])
+		return cg_store[no];
 
 	SDL_Surface *sf = cg_load_as_sdlsurface(no - 1);
 	if (!sf) {
@@ -292,11 +301,13 @@ void scg_partcopy(int wNumDstCG, int wNumSrcCG, int wX, int wY, int wWidth, int
 
 // 全てのCGの開放
 void scg_freeall(void) {
-	int i;
-	
-	for (i = 1; i < CGMAX; i++) {
+	if (!cg_store)
+		return;
+	for (int i = 1; i < CGMAX; i++) {
 		scg_free(i);
 	}
+	free(cg_store);
+	cg_store = NULL;
 }
 
 /**
@@ -306,28 +317,29 @@ void scg_freeall(void) {
 void scg_free(int no) {
 	SPCG_ASSERT_NO(no);
 	
-	cginfo_t *cg = sact.cg[no];
+	if (!cg_store) return;
+	cginfo_t *cg = cg_store[no];
 	if (!cg) return;
 	
 	scg_deref(cg);
-	sact.cg[no] = NULL;
+	cg_store[no] = NULL;
 }
 
 // CGの種類を取得
 int scg_querytype(int wNumCG) {
 	if (wNumCG >= (CGMAX -1)) return CG_NOTUSED;
-	if (sact.cg[wNumCG] == NULL) return CG_NOTUSED;
-	return sact.cg[wNumCG]->type;
+	if (!cg_store || !cg_store[wNumCG]) return CG_NOTUSED;
+	return cg_store[wNumCG]->type;
 }
 
 // CGの大きさを取得
 bool scg_querysize(int wNumCG, int *w, int *h) {
 	if (wNumCG >= (CGMAX -1)) goto errexit;
-	if (sact.cg[wNumCG] == NULL) goto errexit;
-	if (sact.cg[wNumCG]->sf == NULL) goto errexit;
+	if (!cg_store || !cg_store[wNumCG]) goto errexit;
+	if (cg_store[wNumCG]->sf == NULL) goto errexit;
 
-	*w = sact.cg[wNumCG]->sf->w;
-	*h = sact.cg[wNumCG]->sf->h;
+	*w = cg_store[wNumCG]->sf->w;
+	*h = cg_store[wNumCG]->sf->h;
 	
 	return true;
 
@@ -339,15 +351,15 @@ bool scg_querysize(int wNumCG, int *w, int *h) {
 // CGのBPPを取得
 int scg_querybpp(int wNumCG) {
 	if (wNumCG >= (CGMAX -1)) return 0;
-	if (sact.cg[wNumCG] == NULL) return 0;
-	if (sact.cg[wNumCG]->sf == NULL) return 0;
-	return sact.cg[wNumCG]->sf->format->BitsPerPixel;
+	if (!cg_store || !cg_store[wNumCG]) return 0;
+	if (cg_store[wNumCG]->sf == NULL) return 0;
+	return cg_store[wNumCG]->sf->format->BitsPerPixel;
 }
 
 // CGの alphamap が存在するかを取得
 bool scg_existalphamap(int wNumCG) {
 	if (wNumCG >= (CGMAX -1)) return false;
-	if (sact.cg[wNumCG] == NULL) return false;
-	if (sact.cg[wNumCG]->sf == NULL) return false;
-	return SDL_ISPIXELFORMAT_ALPHA(sact.cg[wNumCG]->sf->format->format);
+	if (!cg_store || !cg_store[wNumCG]) return false;
+	if (cg_store[wNumCG]->sf == NULL) return false;
+	return SDL_ISPIXELFORMAT_ALPHA(cg_store[wNumCG]->sf->format->format);
 }
diff --git a/modules/SACT/sactcg.h b/modules/lib/sactcg.h
similarity index 90%
rename from modules/SACT/sactcg.h
rename to modules/lib/sactcg.h
index 1edfa3b..2ffc852 100644
--- a/modules/SACT/sactcg.h
+++ b/modules/lib/sactcg.h
@@ -25,7 +25,21 @@
 #define __SACTCG_H__
 
 #include "portab.h"
-#include "sact.h"
+
+enum sactcg_type {
+	CG_NOTUSED = 0,
+	CG_LINKED  = 1,
+	CG_SET     = 2,
+	CG_REVERSE = 3,
+	CG_STRETCH = 4
+};
+
+typedef struct {
+	enum sactcg_type type;
+	int no;
+	struct SDL_Surface *sf;
+	int refcnt;
+} cginfo_t;
 
 cginfo_t *scg_addref(int no);
 void scg_deref(cginfo_t *cg);