Mai, who had been abused by her parents in her childhood, couldn't come to terms with her past memories and spent days just forgetting time and playing with her best friend Kana. One day, Mai encounters a cosplay killer who repeats killer in the form of an anime character cosplay. Strangely intrigued by Mai, the cosplay killer hides his true identity and approaches her. While Mai hides the trauma and the killer hides his true form, the two gradually deepen their relationship and are strongly attracted by the invisible "something". However, when they find out what each other is hiding, it means separation.