Definition: Akatsuki is a Japanese term meaning 'unlucky friend.' It's a play on words as it refers to a person who has been unlucky before, like a cat having several kittens that it was unlucky to have in the past. The word comes from the ancient Japanese concept of Akatsukai, which refers to a person who had just become friends with an evil spirit or monster and then suddenly had their life turn around due to the demon's actions.