"Make a deal with me. I promise, I will guarantee your safety." Aoi made a mistake on her very first day of her work as a bartender in a coffee shop. In result to that, she got scolded by her boss and got fired from her work. Worst things happens after that. Her whole family suddenly slaughters mercilessly by an unknown group. No one's there for her so she lost her insanity because of what she witness horribly and was in the middle of planning to kill herself but a cat appears and speaks to her all of sudden. Wait, a talking cat?! "In that case, you need MY help." The cat said. "W-what do you mean?" "Heh. Don't kid yourself anymore. I know you wanted revenge. You wanted a power to fight. If so, you need ME." Lured by the cat's tempting words and by her urge to fight back, Aoi established a pact with the cat and with just that, she never thought that it really made a big changes in her life and what more is, she got entangled by the battle for the throne and powers in between demons and angels.