Koi wa Hito no Hoka

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Both of these manga involve a romance between a youkai and a high school human girl.  

both main cheracter can see things nobody else can. One day, she is attacked by a demons, and a puppy comes to her rescue. 

The manga storyline is very similar. Both of the main characters are females who make a contract with a demon. The demon continues to follow them around to protect them, so they can eventually "eat" them. The protagonists are strong willed and determined to save others in each of the manga. 

Main male protagonist is a demon who promised something to the main female lead character. Both has elements of supernatural and fantasy and has ayakashi/yokai as supporting characters. Both has female lead characters that seemed 'tasty' and is being sought after by yokais/ayakashis. While Koi wa Hito no Haka is more of the shoujo type, Black Bird, however, has more mature side on it.