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Seiteki Zecchou wo Oshiete!: Sei Chishiki Zero no JK Imouto to SEX Kobetsu Jugyou
性的絶頂をおしえて！～性知識ゼロのJK妹とSEX個別授業～
A high school girl with zero knowledge about sex finds herself in an unexpected situation when her older brother decides to teach her everything she needs to know. As a responsible sibling, he takes it upon himself to educate her through private lessons, starting from the very basics. The girl, curious but completely inexperienced, reluctantly agrees to learn from him, unaware of how far these lessons will go.
What begins as an awkward educational session quickly escalates into something far more intimate. With each lesson, the boundaries between teacher and student blur, and the siblings find themselves crossing lines that can never be uncrossed. The brother's methodical approach to sex education leads them down a path of forbidden discovery, where every new piece of knowledge brings them closer together in ways neither anticipated.
