an immortal and demon join the sins?

An out going and human like Immortal cursed by the goddess race thousands of years before meets a emotionally detached and non-understanding demon commandment and become companions from that day in.
Later on meeting a specific group of skilled people and get stuck with their company from then on, one wants to stay stright and thr other doesn't and attempts to run at every given chance, yet will she grow used to this place and want to stay?

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purely a self indulgent fanfic then my Friend and I got the idea when when bored in math class talking about the anime.
they- arcane in this are the one who wrote and drew the cover art
I- Samu just help with ideas and how to develop plot, Along with possibly events to happen later on basically don't do much so it all my friends work.