Kira Aoyama was a newcomer in the Violent Crime division as a replacement for Toru Hasegawa (after the rain, Femme Fatale #2) But when someone ran her over and caused her to have a temporary amnesia, she was mistaken for the daughter-in-law of a chaebol family - Reina Kamisato - who disappeared right when Kira was hit. Even with amnesia, she still had her strong, no-fuss personality that drove everyone in the toxic family crazy, and wondered if the accident shook some screws loose. The question was, where was the real Reina Kamisato? And why did she disappear without a trace? Moreover, why did both Kira and Reina have the exact same face when they were not aware of each other's existence? Or were they?