Black Crow is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

One day, Agni met a man named Angkasa who claimed to be a part of the Black Crow guild which was annihilated in the Great War. But Angkasa wants to revive it.