User blog comment:B214/Volume 22 spoilers/@comment-90.219.230.72-20161127161312/@comment-9595671-20161130024959

For all we know, in Volume 23 we could see an illustrion of Bina's mask right as she either takes it off, or something makes it either come off or break.

It was mentioned in the next volume, something's gonna happen during the tournament, and depending on what it could lead to her unmasking.