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...
Our champions, the two 
Silver Wings, have passed on.
نصيرانا، الجناحان الفضّيان، قد توفّيا
Die beiden Helden, die schimmernden
Schwingen, sind von uns gegangen.
Nuestros héroes,
los Alas Plateadas, han muerto.
Nuestros héroes,
los Alas Plateadas, han muerto.
Nos héros, les Ailes des glaciers,
auraient tous deux péri.
I nostri eroi,
Nossos campeões, os dois
Asas de Prata, acabam de morrer.
Известные герои…
Пара Серебряных крыльев погибла.