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 I had no idea he was hunting 
down demons disguised as humans...
لكن لم أكن أعلم أنّه يصطاد الشّياطين
المتنكّرين بهيئة بشر
aber dass er Dämonen jagt,
die Menschengestalt angenommen haben …
pero no creí que cazaría
a los demonios disfrazados.
pero no esperé que cazara
a los demonios disfrazados.
invece ha inseguito tutti i diavoli 
che avevano preso sembianze umane.
...que tivesse ido caçar demônios
disfarçados de humanos...