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"So remember that thing Grey said about not having it be a jumbled mess? That was a lie."
-Naoto Aozaki

So I might as well 'explain' a bit. The dots are 'origins', for example, Moeka has heard of Saya (because there's a very unlikely chance that she hasn't), but Saya hasn't heard of Moeka. 

Most of the designations are self explanatory, "Friends" is probably the wonkiest one, but all it means is that a person has had sufficient experience with another person, but the latter doesn't really know if the former's a real friend. It's like that one friend that acts like a dick to everyone, but people still let hang around. Something like that.

And these are all subject to change, given that we're only on the first bit. Might change it every 5 chapters or summin'