 If you liked
Boukyaku no Senritsu
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 ...then you might like
Gleipnir
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I wanted to rec something that gets the dark fantasy, strange world, vibes /and/ the dark sexuality right, where I thought Gleipnir does a pretty poor job with the latter.
Melody of Oblivion does not, still after I can't say how many shows watched one of the most strangely sensual anime I've seen.
The shows are similar in that there is a hidden conflict going on in both worlds that only a select few are aware of and participating in. The manifestation of abilities covers a lot of ground in the monsters of both shows.