Sono Akuyaku Kizoku, Mama Heroine ga Sukisugiru ~Shinshi na Doryoku de Saikyou to nari Fuguu na Oshikyara Tasukemakuru~

In a certain video game, the mature female characters were cruelly relegated to minor supporting roles, doomed to meet tragic and unfortunate endings. Devastated by their fates, the protagonist spent countless days desperately searching for a hidden route that might save them. When his efforts ultimately failed, he was left with nothing but disappointment—until his reality was suddenly upended. Without warning, he found himself transmigrated directly into the very game world he had obsessed over, reborn not as a hero, but as a villainous aristocrat destined to appear only in the story’s worst bad-end routes. Now trapped in the body of a character marked for ruin, he faces a dire dilemma. To survive, he must find a way to escape his own certain death while simultaneously altering the grim destinies of the older women he admires so deeply. Armed with his extensive knowledge of the game’s mechanics and driven by an unwavering devotion to his favorite characters, he sets out to rewrite the narrative entirely. What follows is a determined struggle against fate itself, as this unlikely nobleman fights to protect the women he loves, forging a path toward ultimate power and a blissful harem life against all odds.