The Little Busters are still short a few members, so Riki decides to invite a girl from a neighboring class, Saigusa Haruka, to the team. But the energetic, playful Haruka has a reputation for being the school's biggest troublemaker, and is under constant pursuit by the school's Disciplinary Committee.

Mio has been absent from school for several days, and everyone, even the Little Busters, seems to be gradually forgetting about her. Riki finally spots her in the courtyard again, but he notices an unfamiliar loneliness in her eyes...

Kud shares an ancient island custom with Riki as she remembers the time she spent with her mother.