4화: 히로유키가 카라테부 주장과의 경쟁 속 아오이의 익스트림 룰즈 부를 지원한다

4

Switching from an older girl to a younger one, Hiroyuki is now the senpai who lets himself be entangled by the aspirations of a younger girl, the feisty first year Aoi who is trying to set up an Extreme Rules martial arts club. However the head of the karate club comes to make trouble, and egged on by an outsider (who turns out to be Serika's younger sister) challenges Aoi to a fight. The episode culminates in a contest between the two girls which serves to attract new members to Aoi's fledgling club. (Source: Wikipedia)