Masaki Amamiya is the middle brother of the Amamiya Brothers. Takeru is the oldest and Hiroto is the youngest. He is a cheery and good-humored person. He loves to flirt with a lot of girls but get no luck in getting love. He always tries his best to avoid unnecessary violence but when he gets prompted he won't be able to stop. Moreover, he is an understanding person. He practiced martial arts along his brothers.