Sumire is busy working at a magazine editing production company. She is so busy that she has to take work home with her, leading to stressful days. One day, her younger brother, Nozomu, gathers the members of his film club at his house to hold a film-making camp. Wanting to release her stress, Sumire seduces one of her brother's friends who comes out into the hallway unable to sleep, and after teasing him with a grinding hell, she takes his virginity. Not satisfied with that, the next day she gets other friends and even her younger brother involved, taking everyone's virginity...