User blog comment:B214/Volume 22 spoilers/@comment-25262334-20160720010158/@comment-25262334-20160720012240

Crimson and Darkness: I don't believe that she is newcomer. Whole thing with mask would not make sense in such case. She is obviously familiar character that just hides her identity. And I think that I know who exactly she is. (Hint: There isn't too much characters that fits given description. ^_^)