What friendship level does Kaguya have to be to unlock fated contractor?

Hiashi wrote:What friendship level does Kaguya have to be to unlock fated contractor?

Well, to find it we could keep saying the level kaguya is at and whether you have it unlocked
eg. someone says x, next person x-2 etc. until we hit the number :) unless someone already knows it. Then it can be added to the wiki :D

so... definitely unlocked at 20 (note: can not be used for untyped magatama)