In a world where magic is everything, Asta, a boy who was born with no magic, aims to become the "Wizard King" to overcome adversity, prove his power, and keep his oath with his friends.

Corporate worker Mikami is stabbed by a random killer, is reborn to an alternate world. But he is reborn as a slime. He is Thrown into this new world with the name Rimuru, he begins his quest to create a world that's welcoming to all races

The special has the Straw Hat Pirates fight Foxy again in the New World, on Mushroom Island. This soon gives way to a battle against the Marines on an island called Nebulandia that can nullify Devil Fruit powers.