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...
As king, I am grateful that you have 
offered your life for this nation.
بصِفتي الملك، أنا ممتنٌّ لكِ على وهبكِ
حياتكِ لأجل هذه الدّولة
Dass Sie sich für das Land
so aufgeopfert haben,
Como rey, te agradezco
que ofrezcas tu vida por el país.
Como rey, te agradezco
que ofrezcas tu vida por el país.
En tant que roi, je te remercie
de donner ta vie pour notre pays.
In qualità di re di questo Paese,
vorrei esprimerti la mia gratitudine
Como rei, estou grato que você
ofereça sua vida por esta nação.
За то, что отдашь своё тело
во благо королевства…