The Little Busters' trip was a complete success, and summer vacation has finally begun. Everyone heads home for a bit to see their families. Everyone, that is, except for Riki (who has no family) and Kud (whose family lives in another country). One day, an accident occurs that floods the men's dormitory, which leaves Riki with no place to stay. Luckily, Kud is willing to lend a hand, and she's also looking for a roommate.