Mitsuishi

Nao's other best friend, also known as Mi-chan. He is the son of a doctor. He starts dating Marina later on in the series. He has loved Marina,as far as he has known. In one of the chapters, Marina thought that he was getting too busy with his school,(while everyone goes to Kubo High,he goes to a different high school because of sports)he once cancelled on a date because he had to study for exams, so Nao and Marina were shopping and Nao asked her to just visit him (on the same day their date had been cancelled). After Marina agreed, they reached Mi-chan's house just to find him coming down the stairs with another girl. Marina gets heart-broken and then leaves without saying a word upon seeing this scene. However, it turns out to be a misunderstanding, because when Nao questions Mi-chan about this, she finds out its just his study group. Nao talks to Marina about it and tries to explain to her that it was a misunderstanding, to which she replies by saying "Maybe I should just break up with him!" Upon hearing this, Mi-chan later makes-up with her when she comes back home from her computer classes and fins Mi-chan sitting on the stairs of her front door. When she asks him since when he was there, he replies saying that he went there right after his school was over(which was 5 hours)and then she asks him about what happened to his club and he says he skipped. This really touches her and she gives him a kiss on his left cheek. After this they make-up.