Hinoe's former student and ex-lover. At a time, Hinoe allowed a homeless Misuto to stay in her basement and, between that time, began to tutor him in spiritual subjects. They developed feelings sometime after and began a relationship.
The two of them clashed frequently; Misuto had a pessimistic worldview, whereas Hinoe was optimistic. Despite her feelings for him, it wasn't something he was capable of understanding, let alone agree with.
Hinoe ultimately ended the relationship because she couldn't continue to be with someone who saw the world in such a way, and she could do nothing to change his mind.