The slime hits the big-time! Rimuru and his closest allies are invited to the kingdom of Engrassia to speak to the prestigious Council of the West. Will their plans come true, and Tempest, the monster kingdom, be allowed a seat among the human nations? But Maribel the Greedy-the mind-controlling heir of the all-powerful Rozzo family-won't let Rimuru's new country stop her plans for domination. And arrayed against them are not just Maribel's psychic powers, but high-tech weapons brought from another world…!