Yuusha ni Korosareru Akutoku Ryoushu ni Tensei Shita Ore, Joban ni Kitae Sugita Sei de Yuusha no Chii wo Ubatte Shimau

I'm hated by the reincarnated hero, but that's not my problem! After rage-quitting and actually dying because of how awful the hobbyist-made game "Darkness Fantasy" was (seriously, it had tons of 1-star reviews), I woke up inside the game as Oga, a corrupt noble boss character who preys on women and gets brutally killed by the hero halfway through the story! Not wanting to meet the same grim fate, I trained like crazy to change my future. "Wait, isn't the hero... kinda weak? ...Dammit! I'm supposed to be the hero!" All I wanted was to avoid a bad ending, but somehow, I ended up stealing the hero's spotlight, his love interests, and even his destiny...! (Source: Coolmic)