He is the bass player of Blast. The youngest member of the band, he is 15 years old and from a dysfunctional family. Shin is the surrogate son of Hachi, who is very over-protective of him. He moonlights as a male prostitute, with Reira being one of his "clients." Among other things, he's an expert mahjong player, and a confidant of Nobu. He's also the only member of Blast who smokes "Black Stones" besides Yasu.