Under the rule that they may urinate only when time is up, this project has women endure the urge to pee in front of a hidden camera. Starting with a strong need to urinate, viewers can enjoy their unique and individual ways of holding it in. After the initial timer ends, a 16-minute extension timer is secretly added, which the participants don't know about—making their reactions when they open the box a key highlight. They continue enduring desperately, sharing personal stories about their urges, pressing their hands between their legs, squirming their feet and hips, all while struggling intensely. The brief moment of relief when the timer goes off quickly turns to shock upon opening the box, and despite cursing the situation, they begin holding it in once more. Those who endure are measured for urine volume, and their bladder distension is also recorded. In this installment, three women end up wetting themselves. [Yumiko] A college student who showed calm endurance at first, but suddenly squatted down mid-way saying, "It's a bit too much," her shame clearly visible on her face. [Tsukasa] A female student from a cultural club who endures quietly with a pained expression. Though she talks about the sensation of her damp panties, she appears to have held it in successfully. [Yuki] An office lady who displays a sensual style of endurance from the start, saying, "No, I'm gonna cry," holding on surprisingly long before finally breaking with, "I let it out..." [Marie] A busty E-cup office lady who endures with great variety—pacing back and forth standing up, pressing her front, sitting down, squeezing her crotch, grinding her thighs together. She endures shamelessly, complaining, "This is so mean," yet manages to hold it until the very end. [Yuuka] A dance club member who starts off with a charming, cheerful smile, but gradually loses her composure—a pleasure to watch. She trembles, muttering, "Ah, I'm gonna let it out..." and eventually collapses in exhaustion. Full facial exposure throughout the main feature.