 If you liked
Tactics
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 ...then you might like
Zoku Natsume Yuujinchou
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Tactics is really similar to NY because they both relate main characters that had gone through a rough time in their childhood, but now they have friends. Tactics is a little bit gloomier, thought.
Both, Kantarou & Natsume, have youkai as their friends and also as their servants. Both of them have great spiritual power, but are too soft.