Modern times, where Dungeons have appeared and individuals with abilities make a living by conquering them. Rento Yuuki, a former Hero who returned after defeating the Demon King in another world, was tired of fighting and wished to enjoy a peaceful life immersed in Games. However, after his true identity was seen through by an old friend and he was dragged into Dungeon conquests, his out-of-standard strength quickly became known to the world... "At this rate, I won't even have time to play Gal Games!" Will the day ever come when Rento can enjoy a tranquil life...! A refreshing Low Fantasy where a Hero who once saved another world goes Musou with his out-of-standard power!