I so want to know were this is from

Following the "HE★VENS" tag on Pixiv and the word on this post, all I could find is a three member boy band from the game/manga/anime Uta no Prince-sama. That would explain the genderswap tag. I'll leave the copyright and character tags off until someone can confirm this.

EDIT: Another tag says "uta ☆ puri".