Nameless asterism but with polyamory?
Where did you get polyamory from?
Though confusing, there's actually 4 characters: I forgot their names so I'll describe them: One with long black hair and a moe, another with long black hair, a third with straight shoulderlength blonde/light hair, and a fourth with long wavy blonde/light hair.
And even more confusing, they all don't have feelings for each other in a square. Girl with the moe likes the wavy blonde, and the wavy blonde likes her back. Girl without the moe likes the shoulderlength blonde, and the shoulderlength blonde possibly likes her back... anyways you get my point 4 characters 2 pairs.