He appears in the Railgun Sidestory where Shirai Kuroko thinks he's bullying students--which isn't the case--and has a brief skirmish with her. They stop when they see Kihara Nayuta and Misaka Mikoto fighting near Vending Machine 7116, and both rush to the scene. Gunha steps in and ruins the fight, and prompts Mikoto's anger after saying a few dumb things. They test each other's mettle, where Gunha demonstrates that he is able to catch her Railgun at 30% power in between his teeth. He also managed to withstand various attacks like twin chainsaw-like swords of iron sand and a lightning strike from the sky Mikoto used to attack him. In the end, the Tokiwadai Dorm Supervisor arrives and snaps Mikoto's neck, and warns Gunha to move along, sending shivers up his spine.[2