A monitor to observe psychological state and behavior in situations where the toilet cannot be used.
Hina Kawai has a hip size of 100 and a dynamite butt. Perhaps she can store a large amount of water in her huge hips, but she only urinates about three times a day. Even so, even though she is not allowed to use the toilet, she goes beyond her limits and ends up soaking her underwear that covers her big ass.
