Tập 4: Hiroyuki hỗ trợ câu lạc bộ Extreme Rules của Aoi giữa cuộc cạnh tranh với trưởng câu lạc bộ karate.

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)