Little Busters is an adaptation of Key's romance adventure visual novel of the same name. Riki Naoe was orphaned when his parents died, but his depression is slowly lifted when he befriends a group of kids calling themselves the Little Busters. The series takes place during his second year of high school.

Riki was a child when his parents died, leaving him hopeless and depressed. What saved him was a group of four kids calling themselves the Little Busters. They took Riki out and played with him during his time of need. He really enjoyed being together with them, and his grief gradually faded away. Now in his second year of high school they still hang out, fight and live together, and enjoy their school life.
Little Busters! contains several mini-games, including a baseball practice game and a duel battle system.