 If you liked
Kuroshitsuji
|
 ...then you might like
Mahou Shoujo Madoka★Magica
|
Both are dark animes which involves selling one's life/soul to a different being(demon/incubator) in exchange for a single wish.
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Recommended by zetsuboSensei
✔ Almost the same idea - A superpower grants a wish of yours in exchange of 'you' (the one - in exchange of your soul; the other one - in exchange of your life and powers). That wish in the both of the anime must be considered very well before making the contract.
✔ Both are supernatural thrillers
✔ Both look boring in their beginnings but then some thrilling things start to happen and then you're mindf*cked