Black Bird, Koi wa Hito no Hoka Recommendations
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.