The Heroine is My Stepsister, and I'm her Final Boss

Arnold wakes up trapped as Atlas, the hapless prince in Lara’s beloved otome game—only this version of Atlas has demons bowing at his feet and calling him their messiah. While Lara showers him with sisterly kisses and heartfelt confessions, hordes of fiends whisper promises of ultimate power if he’ll embrace his role as the Final Boss. But with every prophecy he shatters and every spoiler he wields, the original storyline unravels—demons rage, nobles panic, and the game itself tears to shreds. In a world built on scripted endings, Atlas will carve out his own destiny…one deadly choice at a time. In this LitRPG romance gone wrong, survival isn't just about beating the system—it's about escaping the heart of a yandere.