As Lily and friends enjoy their summer vacation, new and unique guests start to appear at Renji's game center.

The game center holds an Otokogi Koala Fighters knockout tournament that attracts a wide variety of players.

Renji's sister Aoi asks him to make her a "game center pro" before she visits the arcade with her friend Lily.

A new challenger shows up at the game center to compete for Renji's attention, but Lily steps in to stop her.

Lily's jealousy is ignited when a pretty girl who visits the arcade turns out to be Renji's college classmate.

Hotaru checks whether her classmates are engaging in meaningful activities in the arcade.

When Lily forces Renji to walk her home on a rainy day, the two happen to run into Lily's intimidating father.

Lily invites her school friends and Renji to her birthday party and shows them how people celebrate in the UK.

After Renji and Lily go on their date, Aoi informs Renji that she invited Lily to come over for a study party.

While working at an arcade, Renji strikes up a friendship with an English girl who can't speak Japanese.