Rui is an eccentric teen, he's a bit..."different" from others. he loves technology and theatre, and he's mostly cute. but others didn't really like him, and he had problems with his family. Rui sings with his two friends, Akito Shinonome and Haruka Kiritani, in their group Mirai toshi de acchi kocchi; they usually add vocaloid KAITO to songs. Rui is a curious, teasing and eccentric guy, but he isn't overly confident in himself.