 If you liked
Erementar Gerad
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 ...then you might like
Kore wa Zombie desu ka?
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In terms of plot they arn't really similar one being a adventure and the other sticking in one city Its main similarity is between Ren and Yuu. They are both unable to show emotion and rarely speak if at all.. ren because she doesnt understand and yuu because it affects the world when she does.