Rui is Tsukasa's boyfriend. Rui meticulous about making every show, making use of his flair for technology.. Rui been Tsukasa's boyfriend for 2 years since third year during Highschool. Now they studied in Kamiyama University. Both of them are roommates and shares the same bed. Rui hates vegetables, and menial tasks. Rui an easy-going genius because his father is a robotic and his mother is a biologist. Rui call Tsukasa Sunshine in the morning and calls him Star at night. Rui is a Dominant Alpha