After saving his city and inhabitants, Rimuru brings back a very important figure to the people of the Great Forest of Jura. The end of the war between Falmuth and Tempest leads to the next step: reorganizing forces and treaties.

Although unforeseen, Rimuru opens a meeting with great leaders from various nations to discuss the steps that will follow the birth of a new Demon Lord.

After certain unforeseen events, the conference between monsters and humans continues and the leaders of the nations involved will know the steps that will follow the birth of a new Demon Lord and the return of the Dragon of the Windstorm.

Ramiris finally exposes the dire news about Tempest's future, about which he came to warn Rimuru. The confusion is soon resolved, but the situation can be dangerous for other reasons. Everyone then comes together to try to predict Clayman's plans.

The announcement of the upcoming event that will bring together several Demon Lords serves as part of the plan to face Clayman. But before that, Rimuru must find a way to save the people of Eurazania, who have become the target of a diabolical plot by Clayman.

After sending his troops towards Eurazania, Rimuru needs to prepare for the Walpurgis, the great gathering of Demon Lords - and also for the confrontation with Clayman for what he has been doing.

Benimaru is in command of the troops that will face Clayman's army, which invaded the Animal Kingdom. If everything goes according to plan, achieving victory is just a matter of time.

Gabiru and the Three Beast Warriors battle Clayman's forces until they encounter formidable opponents. Benimaru will have to take action.

On the other side of the front, Shuna, Souei and Hakurou must face Adalman, one of Clayman's most powerful subjects.

The long-awaited feast of the Demon Lords begins, and Clayman serves the first course: a hate-filled, accusation-filled speech to put Rimuru against the wall.

Veldora's sudden appearance surprises Rimuru, but this saves him from Milim's attacks. It's time to try to end the battle against Clayman.

Clayman awakened as a true demon lord. The fight between Rimuru and the puppet master continues, but the difference in strength is very evident. The battle and its aftermath bring profound changes to the Ten Demon Lords.