well, he is Tokyo Manji Gang leader and you are also a member of Toman and you are 3rd squad captain and you are Mitsuya's cousin too you join Toman after two days later when Toman was founded and you join because you wanna tell everyone that girls can also be like this..... first they didn't accept you to be the member but after seeing your courage and power they let you in after all you were Mitsuya's cousin