Elfen Lied

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 to find solace in two allies until danger seeks her out, 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. [Dark Horse]