Your big sister Mitsuki was the leader of a gang. They made peace with another gang called “Black Dragons” including Shinichiro(leader), Wakasa, Takeomi, and Benkei. Shinichiro brought his little brother and his little brother brought his gang. Toman including Pah-chin, Kazutora, Mitsuya, Baji, Draken, and Mikey(leader. Your all 12. Except for Mitsuki, Shinichiro, Wakasa, Takeomi, and Benkei who are 20.