Yuko, a sister-in-law with a strong sex drive who has been tempted to go to my sleep, but she is tempted to visit her at night

After being transferred suddenly, his brother-in-law Atsushi and his wife Naomi are forced to stay at the Shiraki family for a while. At first, his wife Yuko was happy to welcome her, but after her younger brother and her husband's relationship was so happy that she ended up spending time feeling frustrated... Gradually, her frustration grows, and Yuko can't hold it in and attacks Atsushi's sleep. Atsushi is surprised by the sudden incident, but he is unable to resist the lewd behavior that she shows off and is swayed by her desires. From that day on, Atsushi is forced to be the partner of Yuko's endless carnal desires...