Masaki Amamiya is the middle brother of the Amamiya Brothers. He is a humorous person which makes him the opposite of his serious younger brother, Hiroto. Masaki 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. He practiced martial arts along his brothers.