Little Busters! 番外篇

In peaceful yet somewhat dull days, the members of Little Busters—Kyousuke Natsume, Rin Natsume, Masato Inohara, Kengo Miyazawa, and Riki Naoe—sit together chatting. Masato hates being called the "space idiot" by everyone, so Kyousuke promptly proposes a "Strongest Challenge Tournament," where winning the championship naturally offers a chance to clear one's name. He also assigns seed rankings to everyone present. After that, a series of fun and quirky challenge tournaments are held on campus. Meanwhile, Yuiko Kurugaya helps solve various life problems for Midori Natsume, Komari Kamikita, and Kudryavka Noumi, though her efforts often lead to plenty of laughs. However, just then, a mysterious masked fighter named Saitou appears, defeating one high-ranked opponent after another...