It's a cool story. I'd really like to hear more of.
But be careful not to make you OC into a Mary-Sue, ok?
And you seemed to be mixing up the names in the first chapter, or so. It just confused me a little.(Anne turns into Anna? And Orphan Anne? Wasn't Allia the ophan?)
And no offense, but the Names are a bit off. I mean Karakura is in Japan, so yeah, they can have English names or so, because their parent liked them but Cato is neither Japanese nor English.
But I really enjoyed what I read and hope this review helps (')

continu your fic was good