Buy what? The contract from crafting? I'm not sure if I did that, I don't recall how I triggered the event, but it took waaay too long, like 20 levels. And 20 levels after I did trigger it, I still can't talk to her, or 2B, but I have three empty stars for both at level 15 yet I can't progress them story-wise, or progress anything else. All the quests are checked, but there's one empty slot for a girl in the dorm, Marika? It looks like like I might be at the end of the content with no clear indication of such.