Ryuu Tsuji

Ryu holds the 7th position in school, although his test scores are a poor reflection of his intellectual prowess. He is in 7th place mainly because of the twins - Megumi tends to fall asleep and Jun becomes bored during tests, which results in Ryuu focusing his attention on them instead of his own exam. This is proven in an anime episode, when he answers 1000 questions in 10 minutes, and manages to achieve full marks. He has been close to Megumi and Jun since they were very young; it is evident that he cares for the twins very much and that the three of them see each other as of the CEO of a sports company and one of his family.