Naganuma Mitsuru

She has a very elusive personality, with a relaxed tone of voice and a tendency to suddenly spit out strong venom. Mitsuru can be a bit of a jerk. However, she is trusted by her superiors because she sees the true nature of her opponents. Because of his poisonous tongue, she is often shunned by those below her, but it isn't clear if she knows.

Mitsuru is a self-proclaimed "beautiful and reliable older sister" who actively tries to get involved with younger Taimanin. She likes dark and cramped places, and on her days off, she likes to wrap herself up in her futon and laze around. Loves to use peopws and seems open about the idea of lewd things.

She seems to have an odd sense of humor and little shame, as she redesigned her suit to that of a bunny costume because of a pun regarding "Eels and bunnies".