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Юки Итихара's best friend since middle school, who gave her the male nickname "Yoshiki". He is unable to see Yuki as a girl and does everything to ensure others perceive her as a boy. He wanted to rape Yuki after realizing his feelings for her. Later, he began living exclusively in Mikako Nagao's apartment, where she satisfied his needs, as long as he did not approach Yuki and did not show up at the university.