The eccentric Dr. Tamaki is doing brain research. Hashi, 19 and a half, has a small fragment of a car that remained in his brain after an accident, and since then he can't help but say out loud everything he thinks and feels. Hana, 21, has unexpected orgasms anytime, anywhere, even in public. The brain of 6 year old Mari cannot perceive the people around her, she lives in an isolated world where there is no other human being apart from her. Hideo, 10, says he has "super powers," and can "get in touch with aliens and God."