"Mayu" and "Yuzuka", who are childhood friends and best friends, walk down the mountain instead of hiking on the way back from a short trip, and get lost in the mountain trail.A man named Taichi took care of the exhausted two men, and he was a brutal man whose daily routine was to bring women to his father's mountain villa and imprison them.The two who can't even resist are crossed around without contraception.The local yakuza, who took notice of the act, also got mixed up, and the two who were turned into sex slaves gradually lost their personalities.