Now in huge-o-vision.

"にぎやかしに記念投稿。　　　　*お友達との夏の思い出。合作。そんなネタ絵。そういやネタ出し担当は私でした。すいませんでした。反省は全くしていない。またやらかしているなう" - nichiru

Added the "tagme" tag because perhaps now that it's in huge-o-vision, the characters are not who they were originally believed to be, specificially sakura and gilgamesh.

Still looks Sakura to me, although the blonde guy in the back could be the dude from Tsukihime whose name I have no idea of. Warachia? *shrug*

The hair's kind of pale, so it actually might be SHIKI---but the nudity kind of indeed suggests Gilgamesh.

Definitely Gil. And the purple haired chick is Sakura. As for foreignreign, Wallachia has blonde hair and is Dracula.

That definitely looks like Sakura in the back. Asagami Fujino has a different hairstyle without a ribbon, and I think her hair's more of an indigo color anyway. And besides the haircolor the guy in the water still looks a lot like Gil.

Yeah, it's definitely Sakura. The ribbon is a dead giveaway, her hair is right, and it looks like she's wearing the bikini that Sakura wears in HA, too.

I counted 7 Neko-Arcs... Can you see them all?

I spy with my little eyes...

Alba's red top hat. Should that be tagged? :|a