Elfen Lied Omnibus Vol 1

Captured and isolated against their will, the Diclonius species are a threat waiting to break free. When a young Diclonius girl, Nyu, escapes from the research facility she was being held in, she manages finds solace in two allies, until danger finds her again, putting everyone at risk. However, her enemies soon realize they're in over their heads as an attempt to subdue Nyu results in unspeakable tragedy.

Cited as an inspiration for Stranger Things by the show's creators:

"I had seen an anime called Elfen Lied that is clearly inspired by Akira. And that was really influential. When I watched it I though it felt like an ultraviolent E.T. There were a lot of things in there that I really liked and that made their way into the show, particularly related to the character of Eleven."--Matt Duffer, Co-Creator of Stranger Things