Hachiman Hikigaya is a loner with an inferiority complex who is tricked into joining the "Service Club" that helps students with their problems… at all costs.

Yui invites Hachiman and Komachi to the annual summer fireworks festival. The pair run into Haruno, who explains the complicated relationship between herself and Yukino.

Soubu High’s Cultural Festival continues and Hachiman is stuck carrying out his duty as a committee member by documenting the day’s events on film.

Hiratsuka-sensei asks the volunteer club to help her contribute to a local magazine themed around marriage. Since none of them, including Hiratsuka-sensei, knows anything about the subject, they ask someone who has experience "taking care of useless deadweight", namely Hatchiman's sister Komachi.