The manga starts off pretty neatly basic isekai death reincarnate formula you then realise that it becomes a sort of "hentai" manga at first this is all it was untill the first serious encounter with the "enemies" of the series is when it gets serious with uban legends coming to life and paralel worlds intertwining is when it gets interesting i dont urge anyone to read as it does have alot of hardcore "hentai" so anyone that isnt ready for that dont read but the story is very interesting and pretty unique the author of elfen lied has turned a hentai story into something that could be a masterpiece looking at the first plot twist is why i think why though