During an art class, Futaba, who has an obsession with breasts, end up drawing various pictures of breasts, one of which the principal determines is a work of art. Whilst at the triplets' house, Shinya tries to stop Yuudai from playing around with Mitsuba's panties, only to get labeled as a pervert himself. This leads Futaba to believe Shinya has an interest in Mitsuba's panties, and continuously tries to give him large amounts of panties all day. When he tries to stop Futaba, Shinya ends up in another seemingly perverted situation in front of Mitsuba.
先生…ふたばのおっぱい画を侮るなかれですよ…。
あの子のおっぱいへのこだわりは異常です…。
決して舐めてはいけませんよ…。
普段はちゃらんぽらんなふたばが唯一真剣になる時…、そこにはおっぱいがあるでしょう…。彼女はおっぱい職人…。
理想の形状を求めて、時には自分に厳しく、さすらう旅人…。
その洗練されたおっぱい画はどんな芸術家のそれより美しく、そして…。エロい！！
見るんです！！普段は見せないあの真剣な顔を……！！
