I'm a gloomy otaku studying pharmacy, and I have a female friend named Haruna, a science major in my class. We share a common hobby of reading erotic manga, and today we were getting excited talking about things I could never discuss with other girls. She's less high-maintenance than guys, and I thought nothing more would ever develop between us... but just as I was thinking that, a condom fell out of Haruna's bag! She panicked, but then she made an unexpected suggestion: "Want to try using a condom?" We ended up going to her place, and she said there was something she wanted to try—she transformed into a reverse cosplay outfit! Both of us got incredibly turned on by her looking like something out of an erotic manga, and we started having sex just like in one. Once we experienced how amazing sex could feel, no one could stop us anymore.