 If you liked
Hitsugikatsugi no Kuro.: Kaichu Tabi no Wa
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 ...then you might like
Kuro
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Both have cute art style with a dark premise for its story. The pacing is also kind of similar in terms of revealing the mysteries and the gradual development of characters' relationships.
The main characters for both titles are children and they have accompanying "animals" - a "cat" in Kuro, and a "bat" in Hitsugikatsugi no Kuro.