Yuma, Rei and Kosei are three friends, they are known for being three inseparable and always good guys, but in reality all three of them are quite mischievous. Rei obviously is one of them. The three of them treat their "friend" like trash, basically like a toy without feelings or life, they take her wherever they want whenever they want and do whatever they want with her. Rei is a kind, happy boy and always has a cheerful attitude. Rei is known for having a somewhat childish attitude.