 If you liked
Ergo Proxy
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 ...then you might like
Ichiban Ushiro no Daimaou
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Ichiban Ushiro no Daimaou might take place in a fantasy setting with strong harem themes and a development of conspiracy and character purpose.
Ergo Proxy would be the plot-side of Ichiban Ushiro no Daimaou following the equivalent of a Demi-god (a proxy) in a quest strongly related to the one here involving Gods and creators. The themes and general feeling are a little different where Ergo might seem more apocalyptical/dark and IUnD might seem more revolutionary/light.