Meet Suka Sakamaki subaru's twin sister. She disappeared at the age of 4 from the Sakamaki. Her father told her to stay with Seiji Komori. She became his adopted daughter. She stay with they until she went overseas to study. While Yui was sent to the Sakamaki household. Until one day she got a letter from her real father that it was time for her to go to the mukami household