Morita's older brother who seems to have a mysterious agenda in earning ridiculously large amounts of money. It is later revealed that he and Morita are working together to buy back his father's company which was purchased by an electrical company when they were kids. Unlike Morita, he is practical-minded and organized. He appears to be one of the few people who can put up with Morita's quirky idiosyncrasies and is able to control Morita to some extent. Kaoru shares a deep relationship with Morita, but sometimes feels envious and inferior towards Morita's talents.