diff --git a/load/bgm.lua b/load/bgm.lua
index 9e28b94..749aed8 100644
--- a/load/bgm.lua
+++ b/load/bgm.lua
@@ -7,13 +7,15 @@ bgm = {
 
 local current_bgm = nil
 local bgm_locked = false
-local unfocused = false
 
 function switchBGM(sound, subsound)
+	if bgm_locked then
+		return
+	end
 	if current_bgm ~= nil then
 		current_bgm:stop()
 	end
-	if bgm_locked or config.bgm_volume <= 0 then
+	if config.bgm_volume <= 0 then
 		current_bgm = nil
 	elseif sound ~= nil then
 		if subsound ~= nil then
@@ -67,24 +69,19 @@ function processBGMFadeout(dt)
 			fadeout_time = 0
 			fading_bgm = false
 		end
-		current_bgm:setVolume(fadeout_time * config.bgm_volume / total_fadeout_time)
+		current_bgm:setVolume(
+			fadeout_time * config.bgm_volume / total_fadeout_time
+		)
 	end
 end
 
-function pauseBGM(f)
-	if f then
-		unfocused = true
-	end
+function pauseBGM()
 	if current_bgm ~= nil then
 		current_bgm:pause()
 	end
 end
 
-function resumeBGM(f)
-	if f and scene.paused and unfocused then
-		unfocused = false
-		return
-	end
+function resumeBGM()
 	if current_bgm ~= nil then
 		current_bgm:play()
 	end
diff --git a/main.lua b/main.lua
index d6980eb..31353b1 100644
--- a/main.lua
+++ b/main.lua
@@ -280,14 +280,6 @@ function love.wheelmoved(x, y)
 	scene:onInputPress({input=nil, type="wheel", x=x, y=y})
 end
 
-function love.focus(f)
-	if f then
-		resumeBGM(true)
-	else
-		pauseBGM(true)
-	end
-end
-
 function love.resize(w, h)
 	GLOBAL_CANVAS:release()
 	GLOBAL_CANVAS = love.graphics.newCanvas(w, h)
diff --git a/scene/credits.lua b/scene/credits.lua
index 63fbc98..62545e3 100644
--- a/scene/credits.lua
+++ b/scene/credits.lua
@@ -16,9 +16,7 @@ function CreditsScene:new()
 end
 
 function CreditsScene:update()
-    if love.window.hasFocus() then
-        self.frames = self.frames + 1
-    end
+    self.frames = self.frames + 1
     if self.frames >= 2100 * self.scroll_speed then
         playSE("mode_decide")
         scene = TitleScene()