Occupation Idol
In episode 11:
SpoilerIt is revealed in that her real name is Sakura Wadagaki, and is merely substituting for the real Yuki Mitsuya after the latter was murdered before the debut of idol group 'Mystery Kiss'.
In episode 13:
SpoilerIt is shown that Sakura murdered Yuki Mitsuya in order to gain a spot in 'Mystery Kiss'
(Source: ODDTAXI Wiki)