The Hero Took Everything from Me, So I Partied with the Hero's Mother! - Chapter 349

Though he received the skills necessary to teleport across worlds, the king who performed the summoning ritual attempted to trick him into wearing a slavery collar, this annoyed him so he kidnapped the princess and returned to Earth.

Leiyin accidentally crossed into the One Piece World, and accidentally obtained the Naruto System.

Dale Mitchell, your average guy in a below-average job. But, what happens to him is anything but average. After hitting someone in his truck, his world was turned upside down, inside out, and more than fifty shades of grey.

Now, he seems to be something called a World Keeper, and must create and manage his own world. Is this his afterlife, or something else entirely?