On his first day of transferring to a new high school, a loner named Mori Buntarou, is cajoled by a classmate into climbing the school building. Despite knowing that one misstep could send him spiraling to his death, he moves forward, and upon finally reaching the top, Mori experiences a sense of fulfillment. That feeling, which seems to be telling him, "You're alive!" gives birth to an adrenaline for rock-climbing.

Note: Sakamoto Shinichi did both the story and the art from Volume 4 onwards.
The manga won an Excellence Prize in the manga division at the 2010 Japan Media Arts Festival. It also won Best Seinen Manga at the 2011 Prix Mangawa Awards.