As she grows, Yuno's solitary diaper play gradually deepens. Boldly visiting a medical clinic, she purchases medical-grade covers and carefully selects ones that fit her body, repeatedly wetting and soiling her diapers. Some attempts end in failure, with leaks slowly seeping out. There are embarrassing moments too—getting caught by her mother and scolded, then being forced to change her diaper. She also experiments with baby clothes and Horminchi. By the time she attends an all-girls school, she's wearing diapers under her sailor uniform and even begins relieving herself outdoors. This work vividly and honestly portrays Yuno's personal diaper experiences, conveying her pure and innocent emotions in an intensely realistic way.