That Time I Got Reincarnated as a Slime Season 4

Rimuru, the Demon Lord, is making progress toward forming an alliance between humans and monsters. However, this goal is threatened by Granville Rozzo and his granddaughter Maribel, who want to rule over humans to protect them, and are at odds with Rimuru over this approach. In related developments, Rimuru's friend and fellow demon lord, Leon, is pursuing his own objectives in El Dorado. A new Hero is also emerging.