Rin's second cousin once removed, and guardian. He and Rin share a very close relationship, almost like a father and daughter or a brother and sister. For a short period of time he was in love with Rin's mother, his own cousin Aki, before she died. After her death he became Rin's official guardian. He is very protective of Rin and does not seem to like Aoki at all because of Rin's affection towards him, which makes Reiji very jealous. As the story progresses, it becomes clear that his inability to fully cope with his lover's death has resulted in his projecting his feelings for her onto her daughter and he has convinced himself that she will take Aki's place once she comes of age.