Sayu is lonely every night because her husband is cold to her due to his busy work schedule. That night, as usual, she tries to comfort herself alone when her perverted father-in-law catches her. However, her father-in-law's assault, which she should have rejected, is a blessing to her lonely body. She knows it's wrong, but her body craves her father-in-law. Meanwhile, her father-in-law brings in acquaintances and forces them to have sex, further increasing the assault...