Naoe Riki was a boy living on the brink of despair. The one to reach out to him was Natsume Kyousuke, a just boy who called himself the leader of the "Little Busters." Every day from then on was like an endless carnival, and the pain in Riki's heart slowly ebbed away. A few years later, the five of them are living in the same school dorm, still living every day like a carnival. But when Kyousuke starts to look for a job, Riki worries that the five friends will drift apart. "Let's start a baseball team. We'll call it... the Little Busters!"