Izumi Makihara

Sanpeita's very well-endowed childhood friend and classmate, who harbors a crush on him. She tries to show her feelings, but Sanpeita is apparently oblivious. Whenever something perverted happens to her, she yells out "Unhealthy", then decks whoever caused the action, which Sanpeita is almost always on the receiving end of her rage. Izumi recognizes the similarity between M.M. and "Mei-chan", her friend from 10 years ago, and pursues her true identity much more fervently than Sanpeita, even calling out Mei-chan and accusing her of being both the girl from 10 years ago and Kemeko in front of the whole school.