Event ● Various troubles that attack "Airi" who has become a body that can not wear underwear due to the technique! The lower half of the body is exposed by a sudden big earthquake at the part-time job! You can look inside the skirt in the study room! ?? Covered with water, the whole body is in a state of invisibility! Get drunk and get confused and open your crotch! "Don't tell everyone! I'll do something good if you keep it a secret." Dangerous campus life with no panties and no bra! Can "Airi" pass safely?