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

Isekai, a medieval fantasy world, was transported to KUZUNO Sekai. He was given a game controller with a three-day countdown timer and the ability to pause time. Presently he needs to sort out the mechanics of this game world and clear it in time.