Mizuki Kashima (Ai Saka Haruna) is a popular idol living a busy daily life. One day, her ex-boyfriend, Shitamura, suddenly appears at a handshake event. Mizuki harbors deep trauma from their past relationship and still carries emotional scars. She strongly rejects Shitamura's sudden reappearance. However, his feelings quickly shift from mere romantic longing to a desire for revenge. His obsession with Mizuki turns into hatred, and he soon begins ruthlessly plotting his vengeance like a demon.