A live-action version of the classic doujinshi that was a huge hit on social media and has been downloaded more than 60,000 times has been realized. A sad and tearful erotic drama depicting the pure love between an older sister and a younger brother. The older sister, who was once active, suddenly stopped going to school and changed. Seeing that she can't do anything, the younger brother gives her a certain role. That is to have sex with his younger brother. Before they know it, a forbidden love begins to grow between the older sister and the younger brother...