A special experiment takes place in a room equipped with four unmanned cameras, where sisters in casual clothing attempt to hold in their urine. The participants already feel a strong urge to pee at the start, but must endure until a timer goes off—during which time their struggle is captured in a documentary style. While sharing personal stories about urination, they desperately try to cope by pressing their fingers against their crotches, shifting their legs and hips, and visibly fighting the urge. When the timer finally rings, they begin releasing the built-up urine after prolonged restraint. Afterward, the volume of urine expelled is measured, and their bloated stomachs are shown with on-screen text indicating the fullness, except for certain censored areas. A new element is introduced where participants must open a box after the timer to receive further instructions, adding suspense. The urination scenes are edited from two angles for better viewing. This release features only those sisters who successfully held their pee until the signal, offering a unique experience focused on urinary endurance. Note that the main feature includes clear facial exposure, so viewer discretion is advised.