Naoto Kadomatsu

A thirdyear student at Jsei High School and a member of its boxing club. He lives in the same apartment building as Minatsu but attends a different school in a different grade. He is a high school boxing champion. He falls in love at first sight with Minatsus alter ego Maria and becomes Shs rival in boxing and in trying to win Minatsus affections after learning that Maria and Minatsu are the same person. Source: Wikipedia