31 year old Takehiko Nakamaru has trained all his life to never be disturbed by anything that the world throws at him, no matter what comes at him, he will remain unfazed. He had conquered "life" and was living in perfect harmony. But when he realizes that his existence in the house inhibits his sister from getting married, his peaceful life is thrown off balance. In his panicked state, he leaves the house for Tokyo in his journey to slay the monster that is called "life".