diff --git a/src/scenario.h b/src/scenario.h
index 13adcee..11d92e9 100644
--- a/src/scenario.h
+++ b/src/scenario.h
@@ -88,9 +88,11 @@ static inline int sl_getc(void) { return sl_sco[sl_index++]; }
 	sys_message(2, "%d,%x: " fmt, sl_getPage(), sl_getIndex(), ##__VA_ARGS__)
 #define DEBUG_COMMAND(fmt, ...) \
 	sys_message(5, "%d,%x: " fmt, sl_getPage(), sl_getIndex(), ##__VA_ARGS__)
+#define DEBUG_MESSAGE(...) sys_message(6, __VA_ARGS__)
 #else
 #define DEBUG_COMMAND(...)
 #define DEBUG_COMMAND_YET(...)
+#define DEBUG_MESSAGE(...)
 #endif
 
 #endif /* !__SCENARIO_ */
diff --git a/src/xsystem35.c b/src/xsystem35.c
index bb7f211..ba40994 100644
--- a/src/xsystem35.c
+++ b/src/xsystem35.c
@@ -86,7 +86,6 @@ static void    sys35_ParseOption(int *argc, char **argv);
 static void    check_profile();
 
 /* for debugging */
-static FILE *fpdebuglog;
 static int debuglv = DEBUGLEVEL;
 enum {
 	DEBUGGER_DISABLED,
@@ -143,11 +142,10 @@ static void sys35_usage(boolean verbose) {
 	
 #ifdef DEBUG
 	puts(" -debuglv #     : debug level");
-	puts("                :  0: critical error message only ");
-	puts("                :  1: + waring message");
-	puts("                :  2: + not implemented command message");
-	puts("                :  5: + implemented command (write to logfile)");
-	puts("                :  6: + message (write to logfile)");
+	puts("                :  1: warings");
+	puts("                :  2: unimplemented commands");
+	puts("                :  5: command trace");
+	puts("                :  6: message trace");
 #endif  
 	puts(" -noantialias   : never use antialiased string");
 	puts(" -fullscreen    : start with fullscreen");
@@ -177,13 +175,6 @@ void sys_message(int lv, char *format, ...) {
 	};
 	int prio = prio_table[min(lv, 5)];
 	__android_log_vprint(prio, "xsystem35", format, args);
-#elif defined (DEBUG)
-	if (lv >= 5) {
-		vfprintf(fpdebuglog, format, args);
-		fflush(fpdebuglog);
-	} else {
-		vfprintf(stderr, format, args);
-	}
 #else
 	vfprintf(stderr, format, args);
 #endif
@@ -255,11 +246,6 @@ static void sys35_remove() {
 #ifdef ENABLE_GTK
 	s39ini_remove();
 #endif
-#if DEBUG
-	if (debuglv >= 3) {
-		fclose(fpdebuglog);
-	}
-#endif
 }
 
 void sys_reset() {
@@ -495,13 +481,6 @@ int main(int argc, char **argv) {
 	check_profile();
 	sys35_ParseOption(&argc, argv);
 	
-#if DEBUG
-	if (debuglv >= 5) {
-		if (NULL == (fpdebuglog = fopen(DEBUGLOGFILE, "w"))) {
-			fpdebuglog = stderr;
-		}
-	}
-#endif
 	if (!initGameResource(&nact->files, gameResourceFile)) {
 #ifdef _WIN32
 		SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "xsystem35", "Cannot find scenario file (*SA.ALD)", NULL);
diff --git a/src/xsystem35.h b/src/xsystem35.h
index 5f168af..614c3e0 100644
--- a/src/xsystem35.h
+++ b/src/xsystem35.h
@@ -31,27 +31,6 @@
 #include "variable.h"
 #include "ald_manager.h"
 
-/* logfile when debug level >= 5 */
-#define DEBUGLOGFILE "./xsystem35.log"
-
-/* 
- debug level in xsystem35
-  0: critical error message only (output to terminal or message box)
-  1: warning only(output to terminal) [stable release default]
-  2: add not inplement message (output to terminal) [devel relase default]
-  5: add command message (output to terminal or FILE)
-  6: add message(output to terminal or FILE)
-*/
-
-#ifdef DEBUG
-#define DEBUG_MESSAGE(...)     sys_message(6, __VA_ARGS__)
-#else
-#define DEBUG_MESSAGE(...)
-#endif
-
-#define System_idle(msec) usleep(1000l * (msec));
-// extern void System_idle(int msec);
-
 /* system35 画面デフォルト */
 #define SYS35_DEFAULT_WIDTH 640
 #define SYS35_DEFAULT_HEIGHT 480