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...
Monsters gain far greater power 
when they are granted names.
تكتسب الوحوش قوّةً أعظم بكثير عندما
تُمنَح أسماء
Erhielt ein Monster einen Namen,
steigerte das seine Kraft signifikant.
Los monstruos consiguen más poder
cuando reciben un nombre.
Los monstruos consiguen más poder
cuando reciben un nombre.
Qualunque creatura, ricevendo un nome,
Ao receber um nome, os monstros
conseguem grande poder.
Магверь, получивший имя,
становится намного сильнее.