After returning home from school at night, the girls secretly indulge in masturbation. Perhaps because it's a quiet time when no one can see them, their actions grow increasingly bold. They surrender completely to pleasure, even forgetting to suppress their moans that could echo through alleyways. But as they let their guard down, their pelvic muscles relax, and no matter how hard they try to hold back, their urethras refuse to stay still. Their underdeveloped clitorises can't withstand the intense stimulation, causing them to forcefully squirt large amounts of urine... These depraved girls can't stop their masturbation, overflowing with both shame and pleasure.