Kana, who lives with her daughter and son-in-law, was frustrated due to her husband's business trip. One day, she found out that her son-in-law, Taiichi, was also in a sexless state and masturbated every night. Seeing his enormous penis, Kana became captivated. 'I have to do something for my daughter,' she thought, and started seducing him with various tactics. Unable to resist his mother-in-law's bold advances, Taiichi gradually couldn't live without her...
