She thought she was Kasumi Yoshizawa. Athletic gymnast, destined for the Olympics, honor student of Shujin Academy... But this was all a lie. In reality, Sumire Yoshizawa had accepted the offer of Takuto Maruki to "change" her into her dead sister, Kasumi,so she wouldn't have to accept the grief. With the help of the Phantom Thieves of Hearts,Sumire was able to accept reality and start her life anew as Sumire and "Violet", falling in love with team leader Joker.