User blog comment:B214/Talk About What You Want! 2/@comment-4547267-20141025043901/@comment-24502975-20141025173235

Volume 9:

"Since letting others see her own nipples would be very embarrassing, Buchou shifted her position so others could not see, and took off her bra."

And you can argue that those Grim Reapers only saw the light emanating from her breasts, but hey, they got annihilated in the end, so it's all good.