Ryuu ranks 7th in the entire school cohort. He is the son of the CEO of a sports car company and one of his family's clients is Yahiro's family. He is an animal lover and is very good at handling children. The twins, Megumi and Jun, are unusually close to him, because they have been together since childhood and it seems that Ryuu has saved them once. It is hinted that perhaps he is smarter than 7th place, but spends the majority of the time during exams worrying about Jun and Megumi, who tend to become bored or sleep during tests.