機能一覧：
・タイマーの背景画像をユーザーの好きな画像に設定可能
・タイマー終了時に背景画像が切り替わる
・タイマーに名称を付けることができる
・勉強用タイマーに好きなアイドルの画像を設定して、楽しく勉強できる
"Oshi-Katsu Timer" is an app that lets you set your favorite idol or "oshi" image as the background for your study or work timer! When the timer ends, the image changes, making your focus time more enjoyable. You can freely customize your favorite backgrounds and timer names to boost your motivation! Create a productive time with your "oshi" by your side!
Features:
・Allows users to set the background image of the timer to any image they like.
・The background image changes when the timer ends.
・Users can assign a name to the timer.
・Users can set an image of their favorite idol for a study timer, making studying more enjoyable.