The mysterious girl that showed up out of nowhere was actually Filo. She's a filolial queen with an advanced transformation ability, and she can even take human form thanks to it. However, her clothes get ripped every time she transforms, meaning Naofumi has to get her some magic clothes if he doesn't want to go broke. The party leaves on a new adventure to gather the materials required.
Transforming clothes are always woven using 
thread made out of the wearer's own mana.
الملابس المُتحوّلة تُحاك دوماً باستخدام
خيط مصنوع من مانا الشّخص المُرتدي
Kleidung, die wieder die ursprüngliche
Form annehmen soll,
Lo que buscan se cose con hilo mágico
hecho a partir del maná del portador.
La ropa que buscáis se cose
con hilo mágico del que la llevará.
Il faut les concevoir avec du fil
Gli abiti che si trasformano insieme al proprietario
sono tessuti con del filo intriso del suo potere magico.
Roupas que se transformam são confeccionadas
usando a mana do próprio usuário.
Чтобы одежда не рвалась,
её надо из пряжи с маной хозяина делать.