Hachiman bears witness as Yui tries to either fit in or break away from her social group. Later, the club receives a new request from an old friend of Hachiman’s.

Hachiman tries his best to relax during Summer break but constant texts from Shizuka concerning the Service Club activities prevent him from doing so.

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.

A mysterious request to helm the upcoming sports festival arrives. The group must band together to figure out a way to pull it off.

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.