Quote from Rochedan

Yeah, I don´t think I read anything about this. I think this was added after I started writing my story which was like two hours after the bracket was up...

To be honest, I was still working on my setting when you submitted your entry, I was kind of shocked.

also if you were using a younger Acel, the one at 18 years old before she joined the organization, you could've turned it into a origin story of how she joined or something. I had the Organization hire the wRHG company in the future to capture Acel. The younger Acel is less trustworthy and more silent than the one most commonly seen. In the personality section, it describes her as aloof and antisocial, so its unlikely she would even talk to Luther let alone ask for his help. Adding or hinting at the Organization being the client would've worked in your favor as well.
But essentially here's my thinking. Afterword:
I interpreted the setting as Acel being in Jail and Luther being sent there for some reason having to fight her. I reasoned that if Acel was going to be in jail then someone would have to go through considerable effort to do so b/c her demon powers can break through almost anything. I also had to create a situation where she would have absolutely no gear. The prison world in the phantom zone came from the idea that the Host would transfer Luther and Cecelia's consciousness to the prison, but since Acel was already in the prison she didn't simply appear there like Luther did.
Furthermore, if Acel was imprisoned why would she be in a cell that she could break out of. So I created Oracle, she represents the Acel of the future and her name isn't Cecelia but I don't want to ruin the suprise so I just call her Oracle.

Acel had always multiple personalities, but unlike most wRHG's she is not aware of it and she typically can't switch willy nilly. The prison cell was designed with Oracle in mind, because she actually has different powers than Cecelia despite being the same person. In fact, Oracle is allowing Cecelia to control her body, b/c she has seen all of it before having Cecelia's memories. Anytime Cecelia sees Oracle, it is an illusion made up by Oracle to make Cecelia think that she was Acel. This is why Luther never even acknowledges Oracle, why Oracle never uses her powers against Luther, and why she didn't "abandon" Cecelia despite the fact that Cecelia's powerset was basically useless in the prison. This is also how Oracle knew about everything in the prison and why Cecelia is unable to move at the end of the story. Oracle retook control of her body, while Cecelia's consciousness remained there with Luther. This is also an illusion by Oracle.
I left the intro to be ambigous b/c I did not want Cecelia to remember about the tournament. Since Oracle has all of Cecelia's memories, its implied that after returning to her own time period, Cecelia will regain her memory of the Tournament.
Its important to note that Cecelia isn't actually Acel's true personality, Oracle is. Cecelia is just the default one that resulted from the growth of her humanity when she was in the Organization

@The organization

We differ a lot about how we write our stories. I like to just start writing and decide what to do while I'm writing it.
My sort of plot about Cecilia was that while she was imprisoned she was fully demon, her "good" side/human side hadn't developed yet.
How did she know Luther's name in the first place? Why was she so eager to go with him?
I left a lot for the readers own interpretation but I suppose that kind of failed.