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...
But the arrival of the champion 
is gonna give hope to everyone!
لكن وصول النّصيرة سيمنح الأمل للجميع
Pero la llegada de la heroína
les dará esperanzas a todos.
Pero la llegada de la heroína
les dará esperanzas a todos.
Mais ça me rassure
d’avoir une héroïne à mes côtés !
Però l'arrivo di un Eroe infonde coraggio a tutti!
Mas a chegada de uma campeã
dá esperanças a todos!
Но теперь, когда с нами герой,
вновь замерцала надежда!