As Wakana is approached by a strange foreigner on her way to school, Konatsu once again finds herself short on members as many of them suddenly quit, with Naoko threatening to dissolve the choir club, along with Taichi's badminton club, unless they can find sufficient members. Taichi manages to recruit Wien and takes him to his apartment, where he meets his sister. The next day, Taichi challenges Konatsu to a 2 vs 3 badminton match in order to obtain each others' members for their club, which inevitably results in the choir club's victory. As a compromise, Konatsu decides to make the club a joint choir and badminton club...