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...
If I let it rampage, it should be 
enough to defeat even an Archdemon!
إذا حرّرتُ غضبه، فينبغي أن يكون كافياً
!لهزيمة حتّى شيطان رئيسي
Wenn ich diese entfessele,
¡Si lo dejo descontrolarse,
bastaría para vencer a un Archidemonio!
¡Si lo dejo atacar,
bastaría para vencer a un Archdemon!
Face à lui, aucun Archidémon
Se lo faccio andare fuori controllo
Se eu abrir mão do controle, deve bastar
para derrotar até um Arquidemônio!
Если дать ей волю,
то и архидемон не устоит!