 If you liked
Petshop of Horrors
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 ...then you might like
Waraenu Warashi: 108 no Karma
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Waraenu Douji - 108 no Gou is a episodic manga that is about a human with a certain desire, gets helped by a Zashiki Warashi. However this help doesn't have a positive spin. In this sense the manga reminds me of Petshop of Horrors, which is about humans with a certain desire, and come to the rumoured petshop for extraordinary pets... with nasty consequences...