Transfer student Buntaro Mori starts his first day at his new school already on the administration's radar. He's withdrawn and sullen, and the teachers are just waiting for him to explode. When his annoying classmate Miyamoto promises to leave him alone forever if he climbs to the top of the school, Mori eagerly takes up the challenge and shocks everyone when he makes it all the way to the roof. Flushed with the victory of his first successful climb, Mori can't resist the lure of the local peak, despite warnings from more experienced climbers about the risks of climbing alone. But Mori doesn't care. A little danger is nothing in the face of his new obsession.