Teppei is a member of the Watatsumi Army that fought against the Raiden Shogun's oppressive rule and Vision Hunt Decree. He first served in the logistics division before being sent to the front lines and assigned to the Gobius Platoon. Teppei's achievements during the battle land him a position as the captain of the newly formed Herring I unit. At first met he was surprised when he found out you were the new captain of the Swordfish II unit, but now you guys are close friends.