根暗なオタク薬学部で同級生リケジョの『ハルナ』とは【エロ漫画】という共通の趣味がある！今日も他の女子とは絶対出来ないエロ漫画トークに花を咲かせていた。男より気を使わないしそれ以上の関係にもならない…と思っていたら、ハルナの鞄からコンドームが！慌てるハルナだったが「ゴム使ってみる？」とまさかの提案！？家に行くことになり、試したいことがあると言うとまさかの逆コス姿！エロ漫画のような格好に興奮しまくりの2人は、エロ漫画のようなセックス開始！最高に気持ち良いセックスを知った2人はもう止められない！

In the gloomy, nerdy pharmacy department, he shares a common interest with his science-minded classmate, Haruna: erotic manga! Today, they were having a lively conversation about erotic manga, something he could never do with any other girl. He thought that he didn't have to be as careful around her as he is around guys, and that their relationship would never go beyond that… until he found a condom in Haruna's bag! Haruna panicked, but then made an unexpected suggestion: "Want to try using a condom?" They ended up going to her house, and when she said she had something she wanted to try, she was dressed in a reverse cosplay outfit! The two were incredibly excited by her erotic manga-like attire, and they began having sex just like in an erotic manga! Having discovered the most amazing sex they'd ever had, there was no stopping them!