A sniper who once belonged to the SORD unit based at St. Aile’s International, Mihama Academy’s sister school. Her main weapon is a Blaser R93. It’s said that once Gumi has you in her sights, there’s no escape - hence her nickname, “Mystic Eye”. Back in her St. Aile’s days, she used to worship upperclassman Ariizumi Shiho, who served as her spotter.

Gumi behaves like an old-school war veteran, and tends to adopt a ludicrously single-minded approach to her duties. Burning with a powerful sense of justice, Gumi takes a hard line against unscrupulous behavior; the harshness of her rebukes can come as quite a shock.

Her special skill is speed eating, and she won’t be beaten in this by anyone.