Soshite, Yuriko wa Hitori ni Natta (2020)

They're both centered around a relationship between two girls and they're both dark high school dramas with plenty of ambiguous characters and some twisted depictions of love. Pyramid Game falls into less harmful stereotypes and Soshite is more explicitly queer but fans of one would enjoy the other

If you like what Yuri and Yurio had going on but wanted it in GL, this is about the best you're going to get (atleast that i've found so far)