Birthday: September 2 

Zodiac sign: Virgo 

Blood type: O 

First year student, who abruptly barged into koto music club room demanding to become a member. He is considered to be delinquent and even upper classmen are scared of him, but Chika is very caring for his friends. His late grandfather was koto craftsman and founder of school’s koto music club. Chika now lives with his aunt Isaki.