Sakura Wadagaki

Occupation: Idol

In episode 11: It is revealed that Sakura is brought in to be a body double substituting for the real Yuki Mitsuya after Yuki was murdered before the debut of idol group 'Mystery Kiss'. Sakura is referred to as Yuki for the majority of the show.

In episode 13: It is revealed that Sakura murdered Yuki Mitsuya in order to gain a spot in 'Mystery Kiss'

(Source: ODDTAXI Wiki, edited)