The leader of the "Little Busters," Kyousuke, returns to school after a job hunting break and calls the old gang together. He suggests that they all do something that they can only do now, while they're young - and that something is playing baseball. Now all Kyousuke, Riki, Masato, Kengo, and Rin need to do is find enough new members to make a complete baseball team...

When was the last time anyone saw Mio reading a book under the tree in the courtyard? What kind of person was she? Riki's memories become vague and he becomes scared that he might forget her completely. Will he be able to find the real Mio before she completely disappears?

Thrust into the role of leader of the Little Busters, Riki is finding it hard to fill Kyousuke shoes.

Having another attack of narcolepsy, Riki realizes that he always falls asleep at the sight of unpleasant situations, since he saw his parents' dead bodies in a car accident when he was a child, and determined to overcome this weakness, he awakens with Rin's help. Knowing that the bus will explode, Riki and Rin start rescuing the other students from the wreckage only to discover that Kyousuke is using his own body to prevent the gas from leaking further.