A monitor that observes psychological state and behavior in situations where the toilet cannot be used. Hina Kawai has a hip size of 100 and a dynamite butt. It seems that they only urinate about three times a day, probably because they can store a large amount of water in their huge hips. Even so, when she is not allowed to use the toilet, she goes beyond her limits and ends up drenching the underwear that covers her big butt. Himena Takahashi, a transvestite who loves diapers, arrives and decides to give Hina a disposable diaper. When my dirty crotch is flopped around by my dirty crotch and she gives me apple juice from a baby bottle, I end up leaking pee again. Hina, who has learned how to put on diapers, decides to use disposable diapers on her humble older sister. She was astonished to see that her humble older sister had a penis, and was blown away by it as if she were a mother. Hina is also very excited to see Himena getting tickled. The two of them are thrilled with their matching diapers, and their crotches are pressed together and rubbed against each other, making them feel naughty. This is a fancy documentary video of such an innocent super hip girl and a diaper loving big sister.