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 it's hard to imagine the 
Silver Wings losing otherwise.
لكن هذا يجعل من الصّعب التّصديق بأنّ
الجناحين الفضّيين قد خسرا
Aber wie haben die schimmernden
Schwingen dann gegen ihn verloren?
Pero es difícil de imaginar
que los Alas Plateadas perdieran.
Pero es difícil de imaginar
que los Alas Plateadas perdieran.
Mais alors,
Ma in questo caso...
Mas, assim, fica difícil imaginar
que ele derrotou os Asas de Prata.
Но…