My wife Fuyumi has a younger sister called Haruka. She is a young college student with a cute, innocent smile and a well-developed body. Haruka is dating Toru, one of Fuyumi's subordinates, but I have had feelings for her for a while now... I can't control my sexual desires whenever I see Haruka... One day, Fuyumi and Toru go on a company trip to Kumamoto. This is my chance, so I call Haruka, rape her, and train her by cumming inside her countless times day and night, recording the memories on video.