説明
: Rimuru had officially become a Demon Lord after defeating Clayman. With the end of Walpurgis, Rimuru's territory now extended to the entirety of the Great Forest of Jura. With more residents at their hands as a result, Rimuru decided to hold a Founder's Festival to celebrate his becoming a Demon Lord and to greet all the representatives of other races coming to see him. Meanwhile, in the Holy Empire of Lubelius, the home ground of the anti-monster religion, Luminous Faith, Hinata, the Captain of the Crusaders, received a letter from Rimuru. However, it was a declaration of war that had been falsified by someone.
With Hinata reportedly heading to Tempest, what decision will Rimuru make?
Rimuru's new challenge in his pursuit of a prosperous, peaceful relationship between humans and monsters, where he must discern the true enemies and allies, begins.