A shy but insatiable woman named Nonomiya enjoys masturbating even when she's just relaxing at home. One day while playing with herself, she becomes nervous that her mother might catch her and starts sweating. She decides to explore her excitement further by exposing herself naked at school during breaks or masturbating openly in classrooms. One night, she finds herself alone in a classroom wearing nothing but her underwear when another student enters looking to steal some girl's gym clothes. Both girls are now vulnerable due to their secrets being exposed, so they decide to wander around the empty school late at night, completely nude...and have wild, unprotected sex!

大人しい性格だけどエロに貧欲な乃々瀬さん。体質なのか普段過ごしてるだけでアソコが濡れる彼女はオナニーが大好き。ある日、家でオナニーをしていると母親に見られそうになりドキドキする。このドキドキをもっと味わいたいと放課後に誰もいない学校で全裸露出をしたり、教室でオナニーを始める。ある夜、教室で全裸になっていると教室に同級生が入ってきて女子の体操着を盗もうとしてる。互いに弱みを握られた二人は誰もいない夜の学校で全裸徘徊、全裸SEXをすることに…。