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 you could injure me, you must 
be stronger than the Silver Wings.
بما أنّكِ استطعتِ جرحي، فلا بدّ وأنّكِ
أقوى من الجناحين الفضّيين
Du hast mich verletzt. Das macht dich besser
als die schimmernden Schwingen.
Si puedes herirme, debes ser
más fuerte que las Alas Plateadas.
Si puedes herirme, debes ser
más fuerte que las Alas Plateadas.
Les deux Ailes n’avaient pas
réussi à me blesser.
Se sei riuscita a ferirmi, vuol dire 
che sei più forte delle Ali d'argento.
Se consegue me causar danos,
é mais forte que aqueles dois Asas de Prata.
Раз смогла меня ранить,
значит, ты сильнее Серебряных крыльев.