Riho's husband unfortunately passed away in a car accident, and her relatives came to express their condolences. Suddenly her father-in-law appeared, who had left when her husband was very young. Her father-in-law was a kind and trustworthy person in front of everyone, but when she was alone, he became a rude person, ready to push her down and do it right in front of her husband's tablet. Because she loves her husband so much, she always resists, but gradually her father-in-law's skills make her drift away and drown in carnal pleasure, accepting to become a toy for him and others...