One day, Azusa, Mio's best friend, comes to stay at their house. Mio and Azusa are happy to see each other again for the first time in three years. Her husband, Takashi, is captivated by her fresh beauty, which makes it hard to believe she is the same age as him. That day, he keeps looking back and forth between Azusa and his wife, and ends up going to sleep with a tormented feeling. Late at night, Takashi is so wide awake from thinking about her that he leaves the room to change his mood. Then, he notices a noise coming from Azusa's bedroom and quietly checks inside...