Reiichi Himuro, 180cm, 28 years old. Single, no girlfriend. He is a math teacher at Habataki Academy and also the homeroom teacher for the heroine's class. He is often perceived as cold, but he is simply bad at expressing his emotions. Because he is socially awkward, he is frequently misunderstood by those around him. He secretly harbors feelings for the heroine. However, not wanting to cause her trouble, he has decided not to confess his feelings until she graduates high school. He has a kind side that cares deeply for his students. When he is alone with the heroine, his voice softens, and he is constantly worrying about her.