Do they exist out of Italy?

These games have been seen in only in the italian arcades.
In other countries they are totally unknown, or known as prototypes, as far I can tell.

Adam & Eve

I said it in Astragames of Milan, the games room owned by Olympia: the name was included on a game directory written on a panel.
The writings on the screen were written using an oriental alphabet, probably japanese kanji (but it can be katakana, or korean as well).
The player controls, in fact, Adam and Eve along a path full of dangers and enemies attacking from all sides. The game was a vertical scrolling game with top-down view, the two protagonists were designed simplistically - with an oversized head - and more than walking, they flew. If one of the two was eliminated, player could continue with one character only.

Au

It's a japanese game made by Tekhan - perhaps the last before changing its name to Tecmo - and in the net you can find also a picture of title screen on the net, but everyone talks about it as a prototype, while in Italy it was seen in arcades like Florida Games, in Verona.
It was a space game similar to Galaxian.

Nekketsu Kouha Kunio-kun

In Italy, a few games room (Florida Games, again) you could find a version of this game not present in MAME and almost unknown.
The difference was in the final: rather than by his minions, the boss was surrounded by the enemies of the previous levels (one for each type) and was very weak. Practically you should enough toward him, hit once and he fainted!