ヤンデレメインのラブコメゲームに転生したと思ったらヤバい子が妹になってしまった件 (Associated Names)

One day, when I was looking at a single girl, I realized that this world was the world of a certain game. In a world with a horror setting covered in a romantic comedy, the girl who became my little sister in that world was the one who would later kill me.