The Yamakawa household consists of a hardworking father and his two sons. Six months ago, the mother returned to her parents' home, leaving the family in a state of separation. To help manage the household, they hire Shiho as a housekeeper. But instead of receiving the professional service she expected, Shiho finds herself drawn into the lewd conspiracy of the lustful Yamakawa men. One after another, she falls into their eerie traps, each more intense than the last, gradually threatening her everyday life. Inside a home that should be filled with familial warmth, Shiho faces shocking trials that leave a lasting mark on her soul.