Riko's old friend from the cram school and the vice president of Minami Middle School's student council. During his childhoods, he didn't have many friends and was often being talked behind him due to his serious attitude and personality. One day, Riko came to him and asked him to teach and help her to improve her grade's in order to get in the Fujisaki Girls Academy, while reluctant about it, he agreed to help her and then they became friends. He was one of people who know reason why Riko enter Fujisaki Girls Academy, and her grandfather's condition. Riko is the one who gave nickname "Yan", and also who make Ikezawa friends to have a better view and understand him. It was thanks to Riko that Ikezawa had a change of personality and became more friendly toward his friends. They both finally met again in volume 2 of the manga and episode 6 of the anime.