Shinichi, raised in a wealthy household, carried emotional scars from his mother's early death during childhood. When his father remarried a beautiful woman who became his stepmother, an unusual attraction began to stir within him. Drawn to her allure, forbidden feelings started to grow. One day, he discovered that his stepmother had shoplifted, giving him leverage over her secret. From that moment, their relationship deepened, gradually revealing a hidden, intimate bond between them.