Habit is something very frightening, it is even scarier than a disease because a disease can be treated with medicine but there is no specific dose to get rid of a habit. The wives in the movie are typical examples, just because of the habit of undressing when sleeping and going to their familiar bed every night, it caused a truly disastrous consequence. That day, a close friend of Ren Usui's husband came to visit, they organized a small party but because they drank a bit too much and there was only one bed in the house, so the Usui couple had to sleep on the floor, giving the bed to the husband's friend. In the middle of the night, Usui suddenly woke up feeling very uncomfortable because his wife usually only wore underwear to sleep but today, because of the guest, she had to wear full clothes. Still half asleep, she unconsciously took off all her outer clothes and jumped into bed to sleep next to her husband's friend without realizing it. This made the friend wake up, inadvertently seeing her charming figure with a bit of alcohol in her body, he couldn't control himself, he started to slowly attack his friend's wife from below...