はつこい に さよなら

While cleaning Hime's room, Aiko stumbles onto her old diary she wrote while she had a crush on Hasekura. She doesn't wanna hurt her sister so she stops seeing Hasekura, and starts dating another guy. Himeko, realizing something strange is going on, sets out to fix the situation at hand.

愛子は姫子の部屋で「支倉先輩ノート」を発見してしまう。先輩の前から身を引こうとする愛子を引き止めるため、姫子は変身して…。