This story takes place before Rimuru's reincarnation. Shizu, also known as the Conqueror of Flames, responds to an urgent request calling her to the Kingdom of Filtwood. When she reaches the castle, many adventurers are already there. What request could have demanded such a huge gathering? It turns out a demon has been revived, and the adventurers have been called to subjugate it. It is said that more than ten of the most skilled adventurers have already been killed by this demon. But there is more to this request than meets the eye...
You see that? We have isolated 
all of you in this location
أرأيتم؟ لقد عزلناكم جميعاً في هذا الموقع
Habt ihr gesehen?
Wir haben euch hier isoliert,
¿Lo ven? Los aislamos en este lugar
¿Lo veis? Os aislamos en este lugar
Vous voyez ?
L'avete visto?
Viram? Nós isolamos todos neste local
Видели?!