I Became the Dungeon BOSS

Lott discovered that he had killed a dungeon BOSS as soon as he traveled through time. The monsters thought he had become a demon lord and were coming to congratulate him and to seize their territory. His relatives thought he had become a demon lord and was coming to conquer and seize territory. But Lott, who had just experienced a battle and was seriously injured, was unable to fight again. So he summoned the most ferocious guard army in history - players!