@dokidoki
I know it's almost obvious, but it's still a spoiler
so use the spoiler tag.
I apologize if some have thought after reading this message that I confirmed what was said below by dokidoki
I just read the 306 chapters here, nothing else
Besides, with a little thought I made an interpretation other than that of dokidoki
If we look at the name of the object that she asks in chapter 304 "frost dragon scale armor"
then the name of the MC weapon "Frost Dragon Halberd" and the fact that only the MC can carry several "magic" objects and not the girl
it seems to me the girl already has a purple grade weapon
this prognosis seems more likely to me