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 place of names, each of them is 
referred to by their signature color.
بدلاً من الأسماء، يُشار إلى كلّ واحد
منهم بلونه المُميّز
Sie hatten keine Namen, sondern wurden nach
ihren ihnen charakteristischen Farben benannt.
En cuanto a sus nombres, cada uno
se refiere a su color característico.
En cuanto a sus nombres, cada uno
se refiere a su color característico.
Ils n’ont pas de vrai nom,
Essi vengono chiamati con il colore 
che li contraddistingue, piuttosto che con un nome.
No lugar de nomes, cada um deles se refere
ao outro por sua cor predominante.
У них нет имён,
а обращаются друг к другу по цветам.