 If you liked
X
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 ...then you might like
Ga-Rei: Zero
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They both have close-knit groups fighting to save the world as well as very tragic undertones, such as broken trust and betrayal. Both have a dark atmosphere and underground organizations of sorts.
Annd to add icing to the cake, Yomi bears a striking physical resembelance to Arashi, while Kagura seems very much like Yuzuriha both in personality and looks, as well as age and pocky-loving.