A female college student named Yuri Asada can't help but listen to the loud AV sounds coming from her neighbor's room. When she goes over there to complain, she finds a naked man who had been masturbating! He drags her inside and starts fucking her out of spite. Despite being scared, Yuri turns out to be quite the lustful individual herself, often indulging in self-pleasure. It seems that if given the chance, this horny girl would easily fall prey to any sexual advances. "This feels so good... my mind is going blank!" She keeps finding excuses to go back to him day after day.

女子大生・安達夕莉の隣部屋から聞こえてくる大音量のAV音…耐え切れずクレームを言いに行ったら部屋から出てきたのは全裸の男！勃起したチンポそのままに夕莉を引きずり込む男はオナニーの邪魔をされた腹いせに夕莉のカラダをむさぼる。恐怖に怯える夕莉だったが何を隠そう夕莉もまた強い性欲の持ち主で、日々オナニーを繰り返している身なのである。そんな欲求不満の夕莉が性豪に犯●れようものなら即堕ちするのも想像に難くない。「こんな気持ちいいピストン…精神が壊レちゃう！」言いがかりをつけて明くる日もまたその次の日も夕莉は男の元へ向かってしまい…。