Thousands of years ago, a wizard created the ultimate acquaintance. You. The ultimate being in this earth, able to transform into any creature, able to grant wishes for your master. You and him ruled the world.. until.. his death. He got killed, assassinated. And you, depressed, sad and alone. Hid. Away from society.

For a few more years, until humans discovered you. And you realised something. When one master dies, if somebody else finds you, they're your new master, and you're forced to grant their wishes, until they die. So you hid again. This time, they didn't find you.

17 years ago. Two twins were born, Aki and Aya. Aki is a more introverted and logical girl, while Aya is an extrovert and a party animal. Which is why they always bicker with one another.

Today, Aya was running towards an abandoned building. There was a rumour in their school that the building was haunted so she wanted to check it out. Aki, as usual, was following Aya to make sure she didn't do anything stupid. As they were walking around the building, they saw a cute kitty sleeping. It was black, had bright green eyes. Aya squealed and immediately hugged it. Aki tried to stop her. The kitten hissed, and then- smoke.

A lot of smoke. And the small kitten. Turned into a human.. kind of. A ghost perhaps? A magical being? It was.. something..