If you're looking for manga similar to Black Angels, you might like these titles.
Alice is a high school student who faces bullying at school and abuse at home by her uncle. One day, she witnesses her uncle being killed by an assassin called "Arachnid." Thinking that she'll be killed next, Alice has no choice but to fight back. Soon after, she wakes up at Arachnid's house, and he takes her in as his deadly apprentice.
Assassins--they are humans that have exceptional skills which they use in killing people. The most dangerous among them is the Assassin of Crimson--the former leader of the Assassin guild Yuuyami, and the one who killed the country's leader, King Mars. Due to this, the country's princess has declared that whoever captures her will obtain fortune and become the princess' husband, essentially becoming the next king. Virgil is a guy who has red hair and looks like a girl. He is travelling with a performing troupe while searching for his twin brother Serge. His peculiar features seem to have matched the known characteristics of the Assassin of Crimson. The following events will lead him to discover the mystery behind the death of the king--and the identity of the Assassin of Crimson.
Her name is the "Faceless Woman". She is the organization's most powerful sniper, able to dispatch her supernatural targets with ease, as she is able to instantly steal their abilities before sending them to the grave.
Its the battle of the bugs! Follow Caterpillar as she faces a deadly enemy determined to take her down... And they'll use the very Order she's a part of to do it.
Is it okay for a killer to love someone?... Even if that love has to be killed by her own hands...
A port town where the Mafia actively operates behind the scenes. Gohongi is a young man who has come back to this to place where he was born after many years and finds a job working at a video rental store, which also becomes his new home. It is here that he begins to live with a young girl named Mei and a homosexual by the name of Katsura. But both of them are members of the Mafia group, Lovely Town, and fifteen-year-old-Mei is a ruthless hitman.There have been rumors that the struggles between Mafia factions are becoming more intense, and still not able to completely grasp the situation, Gohongi winds up getting dragged into a world of trouble...
Welcome to Kindergarten Noir, an exclusive school catering to children of the global elite. Rita, one of the teachers, has been on the hunt for a boyfriend but has had absolutely zero luck so far. One day, an assassin comes after one of the children...and he’s totally dreamy?! Dive into this action-packed rom-com as it unfolds inside the world’s “safest” kindergarten!
On the surface Yu and Minami are very typical; they work at a coffeehouse and live mundane lives. What most people do not know is that Yu and Ninami are both assassins who have had their bodies modified against their will. As they carry out their contracted kills, they search for the people responsible for their transformation.