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...
but there is no restriction saying the 
demon is the only one we can kill.
لكن لا يوجد قيدٌ يمنعنا من قتل أحد آخر
غير الشّيطان
Es besagt nicht, dass man nur diesen Dämonen
töten darf, um das Ziel zu erreichen.
pero nadie dijo que el demonio
fuera el único que podía morir.
pero nadie dijo que el demonio
fuera el único que podía morir.
tuttavia
mas não há restrições dizendo que demônios
são a única coisa que podem ser mortos.
но, заметьте,