That Time I Got Reincarnated as a Slime Season 4

Demon Lord Rimuru's effort to build an alliance between humans and monsters advances as Tempest continues to prosper. That vision faces direct opposition from Granville Rozzo and his granddaughter Maribel, whose own plan for protecting humanity is based on ruling over it.

Their goals bring them into conflict with Rimuru while other powers pursue agendas of their own. In El Dorado, Demon Lord Leon continues working toward separate objectives, and the approaching awakening of a new Hero adds another major force to the changing political balance. Tempest's growth has brought Rimuru closer to the society he wants to create, but it also places him against people with very different ideas about how the world should be protected.