Otome Game Sekai wa Mob ni Kibishii Sekai desu

After finishing an absurdly difficult romance game, an office worker dies and is reborn inside its world as Leon Fou Bartfort, a minor noble who was never supposed to matter. Leon wants a quiet life, but this society favors women and handsome high-ranking men while treating someone like him as disposable. His knowledge of the game helps him recover a lost AI and technology that gives far too much power to a person trying to stay in the background. When another reincarnated player disrupts the original route and harms Olivia and Angelica, Leon cannot ignore it. He enters duels against spoiled princes and keeps winning, only to discover that every victory creates a new problem by raising his status and dragging him further from the anonymous life he wanted.