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.
Looks like we can have 
ourselves some fun tonight.
يبدو أنّنا نستطيع أن نستمتع قليلاً اللّيلة
Heute Abend werden
wir wohl Spaß haben.
Esta noche nos divertiremos.
Esta noche nos divertiremos.
On va bien s’amuser, ce soir.
Pare che stanotte ci divertiremo.
Parece que vamos nos divertir essa noite.
Чувствую, нас ждёт дивная ночь!