Jikan Teishi Yuusha - Yomei 3-ka no Settei ja Sekai wo Sukuu ni wa Mijika Sugiru

Kuzuno Sekai was transported to a medieval fantasy game-like world (isekai). He was given a game controller with the ability to stop time and a 3-day countdown timer. Now he has to figure out the mechanics of this game world and clear it in time.