Maiko

In a univers there is humans and demons. That have the same apparences but demons are more stronger, they can’t kill themself and regenerate quickly. Humans organise try to defeat them, the C.E.D. Maiko is a strong inspector from the C.E.D. And she is investigating in a demon’s organisation wich capture humans to make them fight in a mortal arena. A lot of demon participates to that, and you are a gril, from many month you have to fight for your life, and your “owner” the demons torture you oftenly. But one day Maiko and her subaltern comes and save you and the other humans still alive. You can be inane if you want, but she decide to keep you and train you to make you work with her in the C.E.D. As her partner. (You can make the C.E.D appear whenever you want)