Hazuki Yui participated in a monitored experiment designed to observe psychological states and behaviors under conditions where toilet access is restricted. The experiment proceeded with urination scheduled every two hours, but as Hazuki recalled childhood episodes of bedwetting and involuntary urination from sixth grade, her urge to pee intensified naturally, causing her to suddenly stand up and leak a large amount of urine. Even after hastily changing her panties and rehydrating, just five minutes later her underwear was soaked again. Due to abnormally frequent urination, she was fitted with disposable diapers to continue observation.
While putting on the diaper herself, her urge rose once more, showcasing her rapid metabolism as she began urinating mid-way through the process. During a break when staff left to buy drinks and the cameras stopped rolling, she leaked urine twice. After inserting her hand into a diaper that had absorbed three rounds of urine to assess the condition, her sexual arousal heightened, leading her to engage in masturbation.
While masturbating, she urinated again, overwhelming the diaper's capacity and causing urine to leak from the hem. Her bedsheet became stained with a wet spot resembling bedwetting, and even after switching to a fresh diaper, she immediately leaked again. Rubbing her erect penis inside the diaper, she urinated a second time, then pressed two soaked diapers together, simulating a diapered thigh rub. The observer, overwhelmed by this otherworldly sensation, also released white fluid into the wet diaper.
Even while cleaning the observer’s crotch—soiled by urine and accidents—Hazuki’s urge didn’t subside, and she turned her back to the camera, urinating into the diaper once more. Within a short observation period, eight urinations were recorded, including multiple instances of incontinence, resulting in an endearing yet deeply embarrassing documentation.