A leader in Suzuran's Bandou Faction and good friends with both Hideto Bandou and Senda Naoki. Tatsuya is defeated by Bouya Harumichi en route to the transfer students single handed triumph over the Bandou Faction. After losing there position at Suzuran, Bandou, Senda and Tatsuya became targets of the Front of Armament. In fear of getting attacked like Senda, Tatsuya set up his long time friend Bandou to save his own ass. Bandou was jumped by Mito Yasuyuki and immediately after Yamazaki shared his fate.
Much later Tatsuya attacked former Armament Head Kunou Hideomi in order to renue his friendship with Bandou.
He dropped out from Suzuran and didn't graduate.