 If you liked
Ayashi no Ceres
|
 ...then you might like
Elfen Lied
|
Highly akin for premise and structure.
They are focused on a race of women (with unusual hair colors) superior than normal humans.
Both involve experiments, super powers, gore, split personalities, memory loss, love triangles, romance, incest, and drama.
Also, in both there's a seashell with quite a pivotal role.
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Recommended by RenaPsychoKiller
Blood Gore Labs Experiments Romance
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Recommended by FujiokoSakura
Storyline similar - a race - tennyo/diclonius - of people being oppressed. Main character as personality malfunctions, and deals with betrayal and family ties.