Women challenge a prank where they hold their urine to the limit and attempt to pee normally on a Western-style toilet. Exposing their bare buttocks, they start urinating forcefully, only to discover the toilet bowl is covered with plastic wrap, making it difficult for urine to drain. Unable to stop mid-stream, they panic as their own urine overflows, soaking their buttocks and splashing the surrounding area. The situation escalates as they struggle helplessly, drenched in their own piss. This time, the focus is on their reactions and how these mischievous women handle the chaos. Sakiko moans erotically with soft "nnn, nnn" sounds while trying to hold it, but fails to last until the time and starts peeing. Aoi squeals weakly but manages to endure until the signal, then unleashes a strong stream—her yellow urine pools beneath her, soaking her rear as she exclaims in shock, "Eh? What is this? Am I gonna get in trouble?" Shizuka tries to show restraint but drops out immediately; she begins peeing forcefully, but accidentally farts mid-stream, turning bright red in embarrassment. Mari displays lovely vocal restraint but starts peeing early, then panics: "...Huh? Huh? It's leaking from the toilet! Shit... Huh? Huh?" Karina, with a slightly bulging belly, wanders around struggling to hold it before releasing a massive torrent. She notices the overflowing urine with confused "Hey? Hey?" but can't stop, muttering, "What should I do...? Was that okay?" The Excretion Society makes an appearance as the main feature unfolds with full face exposure!