Yūto's class decides to do a cosplay café for the school festival, for which Yūto asks Haruka to go to Akihabara with him to see examples of cosplay costumes. Unknown to Yūto, Haruka had previously made a promise to her father to meet his client, however she decides to go with Yūto to Akihabara instead. Gentō becomes furious when he finds out and goes and finds them, but Akiho comes just in time to save them again. Haruka makes cookies and goes to give them to Yūto, but is shocked when she finds Yūto on top of Shiina at school.
学園祭「白鳳祭」が近づいた。裕人と椎菜がクラスの実行委員を担当するクラスの出し物は、コスプレ喫茶に決定した。そんな中、コスプレ衣装制作の参考のため、知恵を貸して欲しいと裕人から頼まれる春香。アキバにあるコスプレ衣装専門店のことを裕人に教えた春香は、次の日曜日に行ってみようと彼に誘われるが…。
학교 축제의 실행 위원으로 뽑힌 유토와 시이나는 축제 준비 때문에 정신없이 바쁜 시간을 보내는데, 하루 종일 같이 붙어 다니는 유토와 시이나를 보고 하루카는 내심 허전한 마음이 든다.
