It's been seven days since her husband fell ill and passed away. Mikuru's beautiful and delicate, yet occasionally melancholic expression exudes the sensuality that only a widow can have. There is a man who is following her with lustful eyes. It is her brother-in-law, Momokichi. He has long been in love with Mikuru's beauty. And so, on the solemn seventh day, Momokichi attacks Mikuru. From then on, Mikuru is played with by Momokichi almost every day. However, his relentless penis torture gradually awakens Mikuru to pleasure...