Carnival Phantasm!

So, for anyone who is interested in shows/visual novels/anything made by Type-Moon, This is a cross over show involving every Type-Moon character to date. Even a parody version of one of them. Here is the list of Type-Moon projects that are involved.

Fate/Stay Night
Fate Hollow Ataraxia
Shingestutan Tsukihime
Melty Blood
Kara no Kyoukai (i think)

And i believe thats it. If you want to look at a confusing chart of how each character knows each other, Please click this link.
http://images2.wikia.nocookie.net/__cb20070831040026/typemoon/images/5/56/TYPE-MOON_relations.jpg

And this is the link to the first episode.
http://www.watchanimeon.com/carnival-phantasm-ova-episode-1/