Going Back and Forth Between Earth and The Other World with Space Time Magic

In the web novel 'Going Back and Forth Between Earth and The Other World with Space Time Magic', the protagonist gains the ability to traverse different realms through space-time magic. When the king who summoned him tries to enslave him, he rebels by kidnapping the princess and returning to Earth. This action-packed story blends elements of action, adventure, comedy, fantasy, and slice of life, featuring a male protagonist with hidden abilities and a flair for spatial manipulation. Join him on a journey filled with demons, elves, gods, and heroes in a modern-day setting where he must navigate through a level system and game elements to survive.