Transferring student Nozomi Aiuchi one day couldn't hold it anymore and ended up peeing on the side of the road. Her homeroom teacher, witnessing the scene, decides to force her into the "Potty Club." She is now required to wear diapers under her skirt at school, subjected daily to intense humiliation and shame. Forced pissing experiments in the science lab, threesome experiences with legs wide open and no panties, after-school potty toy torture, vibrator teasing that brings her to the edge while begging for release, and even sex scenes drenched in urine. Initially embarrassed, Nozomi gradually begins to find pleasure in wetting herself, slowly drawn deeper into this world.