Yuu Kotegawa

Оригінальне ім’я: 古手川 遊

Yui's 19 year-old brother, Yuu is a ladies' man, something Yui dislikes. After finding Rito and Yui being chased by hoodlums, he defends the two from the ruffians, while commenting that he hopes Yui will grow to be more mature.