もしも悲劇の悪役貴族に転生した俺が、シナリオ無視してラスボスを殺したら？～呪われてヤンデレ魔王に取り憑かれました。無尽蔵の魔力をゲットしたけどこれで未来を変えられますか!?～ (Associated Names)

The main character is reincarnated as the miserable, villainous aristocrat Wilheim von Cornelius. To change the miserable fate that awaits him, he takes quick action. “Let’s kill the last boss.” He prepares himself and sets off to kill the last boss , who for some reason is hiding in the neighbourhood.. “Giggle. I’ll be looking…