''Mask de Hakurei''.

tehSandwich said:
¡La Roja y Blanca!

In color.

Oops, accidentally voted you down BlueFox. And I wonder who this mysterious lady could be.

The White Mouse strikes again!

Amraphenson said:
Oops, accidentally voted you down BlueFox. And I wonder who this mysterious lady could be.

Now I KNOW you're not a true Touhou fan (yet), since anybody should be able to recognize the most wanton armpits in Gensoukyou!

Kikimaru said:
Now I KNOW you're not a true Touhou fan (yet), since anybody should be able to recognize the most wanton armpits in Gensoukyou!

Sanae?

No, this girl has black hair. It's totally Kaguya.

I say Aya

You guys are so easily fooled. Look at the goddamn ribbons. It's Okuu.

I am surprised that you guys couldn't tell this person is actually Murasa. I am in shock right now.

No one noticed that it's Yoshika in that mask? Even without the zombie pose it's not hard to see.

i can see a face on La Roja y Blanca's chest, it can only be Unzan.

Pfft it's obviously Nue.

This can only be the ex boss for Ten Desires. Clearly ao usagi can see into the future now.

I was thinking black-haired Mokou.

ygeo said:
This can only be the ex boss for Ten Desires. Clearly ao usagi can see into the future now.

Wouldn't surprise me...

Maybe its... Reimu?

neorasp said:
Maybe its... Reimu?

...*laughs* T-that's a good one, Reimu....yeah no way, but good joke though

Obviously it is Kongaara

IDIOTS! The lot of you!! It's obviously Mima!

It's Nue.

Tagging it as Kekko Kamen, it's part of the tag on Pixiv.

Okay, so we've ruled out Reimu. Who else could it be?