After being pressured by her classmates, Mitsuba goes with Futaba to buy a bra. Later, Nipples becomes attracted to the hamster design on Mitsuba's panties, making Hitoha jealous. Mitsuba gets into an argument with Miku Sugisaki over whose breasts are bigger, though ends up in an embarrassing situation. Soujirou is invited to the girls' parents day, though whilst trying to shave his beard to look less suspicious, he ends up shaving all his hair and looking even more suspicious. Mitsuba and Futaba get their essays about their respective feelings towards him mixed up, clashing with his expectations of them.
そろそろ私もブラを買わないとね！
べ、別に杉崎たちに言われたからとかじゃないのよ！
丁度買おうと思っていたのよ！！
でも、こっそり買おうと思ったのに、何でついて来るのよ、このバカふたばは！！
はぁ！？おっぱいなんて売ってるわけ無いでしょ！
…まったく、とっとと買って帰ろう。えっと、安くて可愛いやつは…っと。
え？サイズ？えーっと、このくらいかしら？え！？ち、違うの？
サイズって胸囲のこと？……もっ…、もういいです！！
