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...
It appears their bodies were 
devoured with no trace left behind.
يبدو أنّ جسديهما قد التُهِما دون
أن يبقى لهما أي أثر
Parece que devoraron sus cuerpos
sin dejar rastro.
Parece que devoraron sus cuerpos
sin dejar rastro.
Il ne reste rien de leurs cadavres.
Ils ont été dévorés.
I loro cadaveri
Os relatos dizem que os corpos
foram devorados, sem deixar rastros.
Мне доложили,
что от них не осталось даже костей…