Nice nihonga parody.

Is it truly explicit? No nipples nor genitalia are visible. I've seen worse get rated Questionable.
It took a while to notice why Suika was sporting that ahegao, until I saw where Yuugi's left hand was located. Still covered tho.

spiked club. Sure.

Tagging as subterranean_animism as all characters present were featured in that particular game as either a boss a playable character and reimu's shot type.

Man, what the heck is with Okuu's third eye in this picture? It's weird. Coming out of her belly button.