Tsubasa Tanuma is a classmate who regularly asks Miyuki for love advice. When Miyuki recommends he boldly confess to Kashiwagi, he does so, and they become a couple. He is the son of a hospital director, as well as the grandson of the Shinomiya family physician. Tsubasa's grandfather in particular believes his family is cursed, as both he and his son (Tsubasa's father) became parents when they were 17. His cluelessness about sharing details about his successful relationship annoys the council members.