I'm being kept by my new sister-in-law who is stupid but has a strong sex drive. Mao Hamasaki - Hamazaki Mao

The movie revolves around a new sister-in-law who has a strong sex drive and takes advantage of her brother-in-law. The story explores their illicit relationship, with the sister taking the lead and guiding her brother through various sexual experiences. As they navigate their taboo connection, they must keep it a secret from their family members.