去年まで女子校だった学校に編入したらクラスで男子はボク1人！！とんでもない環境で右も左もわからないボクに、早くも部活の勧誘が！しかもSEX部！なんだそりゃ？そんな部活あるの？と半信半疑のボクに転校初日の放課後、 SEX部の活動を見せてくれることに。ディルドを使ってコンドームを装着する練習したり、濃厚なキス練習…ととにかくエロに特化している活動が目白押し！そんな部活に男子が入部したら…。唯一の本物チ○ポは超貴重な練習材料。しかもボクは童貞なので、そのリアクションにも興味津々。当然、挿入も練習内容に含まれる！結果、童貞だったボクが部活動のおかげですっかりヤリチンに！しかも中出しも体験済み！

I transferred to a school that used to be an all-girls school, and I'm the only boy in my class! It's a crazy environment, and I'm completely lost. But I'm already being recruited for a club! And it's the SEX Club! What's that? Is there really a club like that? Skeptical, I was surprised, but on my first day after school, they showed me what the SEX Club does. We practice putting on condoms using dildos, intense kissing practice… it's all focused on erotic activities! What happens when a boy joins a club like that…? The only real penis is incredibly valuable practice material. And since I'm a virgin, they're very interested in my reaction. Of course, penetration is included in the practice! As a result, I, a virgin, have become a total slut thanks to the club! And I've even experienced internal ejaculation!