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...
This is why we wish to rely 
on all of your strengths.
لهذا نأمل أن نعتمد على قواكم
Deshalb bitte ich um die Hilfe
eines jeden Einzelnen von Ihnen.
Por eso deseamos contar con sus fuerzas.
Por eso deseamos contar con sus fuerzas.
C’est pourquoi nous avons besoin
de votre concours à tous.
Per questo ho bisogno del vostro aiuto.
Esta é a razão para nos apoiarmos
na força de todos vocês.
Поэтому мы надеемся,
что вы поможете в столь тяжёлом деле.