Second year in Kasensou Private Prepatory Academy. Mayuri's classmate. Has the personality of a polite, well-groomed and justified kind of beautiful girl (though a guy). Uses honorifics specifically with Rintarou. Doesn't push his opinions much upon others, but when he does he's quite bashful and blushes quite a bit. Because he's quite serious by nature, he simply believes what others say.

Ayumi is a sixteen-year-old androgynous male shogi player. Due to his sickly mother, he had to leave high school to take care of her. When playing shogi, he pretends to be a girl in order to earn money for competing due to the male league taking two years to qualify.