is the protagonist of the story. A second year high school student who discovers Konoe's secret. Frequently just referred to as Jirō, he suffers gynophobia in which his nose bleeds whenever a girl touches him. He reveals the cause to be his mother and sister practicing their wrestling moves on him on a daily basis for 10 years as part of his training, he states his nose bleeds when a girl touches him because his body developed the reflex because he believed his mother and sister would stop beating him up once he started bleeding (as his blood would ruin the carpet). As a result can take pain well and is fairly competent as a fighter which is kept sharp by his sister, Kureha Sakamachi, who wakes him up every morning with a series of beatings.