He is from the anime Uta no Prince sama. Yes a harem, but he's drop dead gorgeous and I love his voice. ~fan girling~
He was a debuted as a celebrity Hayato (his so called twin) while still attending a music Academy because his songs lack a piece of his heart and they can't have the media find out a debuted celebrity is going to a music school that train rookies.
Later he redebuted in a group called Starish. If you like reverse harems I suggest this one.
Something extra ^-^