Saikyou Kizoku wa Shibou Flag wo Kutsugaesu

High schooler Hiroto Namiki wakes up inside Wish Soul, the game he'd sunk countless hours into—possessing the body of Zeke Ragias. Zeke is the game's most reviled villain, a character doomed to die on every single route. Desperate to survive, Hiroto scrambles to soften his image, only to find he can't speak in anything but villainous sneers! "...If I can't dodge the villain act, then I'll just have to get strong enough to survive!!" And so begins Zeke's all-out struggle to overturn his death flag!!

(Source: Funguild)