真昼ちゃんにお誕生日おめでとうって言ったら「えっ…覚えててくれたんだ……ありがと///」と恥ずかしそうに顔を赤らめてました！結婚しよ

If I was to have wished Mahiru-chan a happy birthday, she'd have blushed and shyly said "Eh? You remembered it for me... Thank you... *blush*"! Let's get married!