Mizuki was forced to live with her stepfather after the death of her stepmother. Unlike her husband, who was always busy with work, her stepfather treated her with constant kindness and consideration, causing her to gradually let down her guard. However, behind that kindness lurked a sinister desire—her stepfather had become obsessed with Mizuki's beauty and was determined to possess her. Unaware of his true intentions, Mizuki's innocent and vulnerable behavior only drew her deeper into his malicious schemes.