diff --git a/src/sdlmain.cpp b/src/sdlmain.cpp
index 6f71979..352c0a9 100644
--- a/src/sdlmain.cpp
+++ b/src/sdlmain.cpp
@@ -111,7 +111,8 @@ int main(int argc, char *argv[])
 
 #ifdef ENABLE_DEBUGGER
 	if (config.debugger_mode != DebuggerMode::DISABLED) {
-		g_debugger = std::make_unique<debugger::Debugger>("ADISK.DAT.symbols", config.debugger_mode);
+		std::string symbols_path = std::string(NACT::get_scenario_filename(game_id)) + ".symbols";
+		g_debugger = std::make_unique<debugger::Debugger>(symbols_path.c_str(), config.debugger_mode);
 		g_debugger->init();
 	}
 #endif
diff --git a/src/sys/nact.cpp b/src/sys/nact.cpp
index 3d6e2c2..dbe1c1a 100644
--- a/src/sys/nact.cpp
+++ b/src/sys/nact.cpp
@@ -26,6 +26,15 @@
 
 extern SDL_Window* g_window;
 
+// static
+const char* NACT::get_scenario_filename(const GameId& game_id)
+{
+	return game_id.is(GameId::RANCE2_HINT) ? "GDISK.DAT" :
+	       game_id.is(GameId::PROG_OMAKE) ? "AGAME.DAT" :
+	       game_id.is(GameId::NISE_NAGURI) ? "ADISK.PAT" :
+	       "ADISK.DAT";
+}
+
 // 初期化
 
 NACT::NACT(const Config& config, const GameId& game_id)
@@ -56,13 +65,10 @@ NACT::NACT(const Config& config, const GameId& game_id)
 	}
 
 	// ADISK.DAT
-	const char* adisk_name =
-		game_id.is(GameId::RANCE2_HINT) ? "GDISK.DAT" :
-		game_id.is(GameId::PROG_OMAKE) ? "AGAME.DAT" :
-		"ADISK.DAT";
-	sco.open(adisk_name);
+	const char* scenario_filename = get_scenario_filename(game_id);
+	sco.open(scenario_filename);
 	if (!sco.loaded())
-		sys_error("Cannot open %s", adisk_name);
+		sys_error("Cannot open %s", scenario_filename);
 	sco.page_jump(0, 2);
 
 	// 各種クラス生成
diff --git a/src/sys/nact.h b/src/sys/nact.h
index 3f6cb93..03b308d 100644
--- a/src/sys/nact.h
+++ b/src/sys/nact.h
@@ -46,6 +46,7 @@ class NACT
 {
 public:
 	static NACT* create(const Config& config, const GameId& game_id);
+	static const char* get_scenario_filename(const GameId& game_id);
 	NACT(const Config& config, const GameId& game_id);
 	virtual ~NACT();