Mitsuo is a freshman studying law in the same university as Banri. After the entrance ceremony, heading for freshman orientation, he gets lost on the campus, and meets and befriends Banri. Banri calls him "Yana-san" (ヤナっさん?). He has been the target of Kōko's obsessiveness, one-sided affection since their elementary school years. He secretly took the exam to this university in an attempt to escape from her. He lives alone in an apartment three train stops away from Banri's. Mitsuo has a crush on Chinami and even confessed to her at a party, only to be rejected, since she thought it was an alcohol-fueled joke. He later becomes romantically interested in Linda.

Voice Range: Cool, Panicky, Nice