Erotic novelist Ichiro lives a carefree bachelor life. However, his kind sister-in-law Nanako worries about him and often takes care of him, frequently treating him to dinner at her home with his brother. One day, he accidentally witnesses his brother and Nanako in an intimate embrace. Ichiro, who secretly harbors feelings for Nanako, is shocked but finds his fantasies spiraling out of control, eventually writing her into his erotic novels as the main character. The next day, when Nanako visits his house with a meal, she ends up reading the story…
