Ultra: as an Ultra, You Let Me Fight Monsters

[Semi-funny + slow-burning + no system + no heroine + heavy plot + non-invincible + multi-world travel] I was cleaning at home, but I accidentally traveled to this strange world, and encountered a strange and disgusting monster while buying groceries at a gas station. This guy looked so disgusting, I really didn't dare to fight him. When I ran to the road, a silver Ultraman suddenly appeared and punched the monster to pieces. Oh my god, the blood was splattered all over the floor. It was so dirty. My heart dropped when I saw it...