I'm Leveling up in a Different World Called Dungeon

All right! I traveled through time and came to this world called the Underground City. All right! When I was desperate, I was saved by a loli who called herself a goddess. All right! In order to survive, I embarked on the road of killing monsters and upgrading. All right! I was picked up by a girl, but why do I feel so miserable. Finally, I became stronger. I thought I could be awesome, but it turned out that my wife was even better than me.