今回は年上彼女です。

入院中の彼女の待ちに待った退院日。
プレゼントを用意し連絡を待っていたら、
窓から風が入り込んでくると同時に彼女の姿が…

みたいな感じ

This time, it's an older girl.

Your girlfriend's long-awaited hospital discharge date.
You prepared a present for her and as you wait for her to message you,
a breeze rolls in through the window and you see her...

Something along those lines.