Hazuki Yui participated as a subject to observe her psychological changes and behavior when unable to access a toilet. Under a strict rule of urinating every two hours, Hazuki repeatedly wets herself shortly after being changed into fresh disposable diapers. She shows the diaper soaked with her urine to the observer, then strokes her hardened penis, becoming aroused again and involuntarily pissing in her diaper once more. With her diaper fully soaked, she rubs the damp material together, performing a diaper grinding act that sends the observer into another realm of sensation, causing him to forcefully leak a stream of white fluid. While Hazuki wipes the mess of her urine and the observer's cum off his groin, she feels a new urge building quickly and turns her back to the camera, leaking urine into her diaper again. This short-term behavioral observation captures the frequent, adorable yet embarrassing incontinence episodes of this young girl with extreme urinary urgency.