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...
In that case, you shall 
be the first one I kill.
في هذه الحالة، ستكونين أوّل من أقتلهم
Dann muss ich wohl mit dir anfangen.
En ese caso,
serás la primera a la que mate.
En ese caso,
serás la primera a la que mate.
Alors, tu viens de signer
ton arrêt de mort.
E sia, sarai la prima di cui mi occuperò.
Nesse caso, você será
a primeira que vou matar.
Ну что ж,
тогда ты первой и умрёшь.