I can't understand what are they doing, anyone explain it?

My guess is some kind of ritual. (hidden for length) spoiler ... demon or spirit Summonation. Floating masks are possessed by one or more petitioned entities. That's probably the limit of their presence in the corporeal plane. What they hope to do with them is anyone's guess really. But Ha ha I really don't know. I've never seen this anime/manga or played the game. But if I had to guess by what I see in the pic then that's what it looks like. I could be wrong.

Kokoro, a rather lifeless and emotionally devoid person, had to rely on her masks to properly communicate her emotions. She is learning how to express her emotions.

datavore said:
My guess is some kind of ritual. (hidden for length) spoiler ... demon or spirit Summonation. Floating masks are possessed by one or more petitioned entities. That's probably the limit of their presence in the corporeal plane. What they hope to do with them is anyone's guess really. But Ha ha I really don't know. I've never seen this anime/manga or played the game. But if I had to guess by what I see in the pic then that's what it looks like. I could be wrong.

totally wrong

So it seems. I did say it was a guess based on almost nothing though. Good thing I don't do that often.

datavore said:
So it seems. I did say it was a guess based on almost nothing though. Good thing I don't do that often.

it's kk
touhou is like a black hole, common sense usually won't hit