College girl sister and brother challenge 24-hour roulette life and get excited with raw sex

Two college students, Akane Shiki, Airi Momose, Asuka Momose, and her brother Tarao, Yakan, and Akira Ashida, are picked up and given the mission of playing roulette for 24 hours. As they complete the extreme tasks, their excitement grows, and they end up licking each other\'s genitals and having raw creampie sex!