Comedy anime about an American student going to Japan I'm looking for a short anime (don't remember if it was a single or a few series).

It was about an American student, obsessed with martial arts, who gets an invitation from his Japanese friend to visit her family in Japan. He got a sword from her (I think it was symbol of marriage or something like that).

So they go to Japan, and meet the weird family - I remember there were two undercover chicks with the father, some female agent, and lot's of craziness around.

Lots of nudity too, as I remember, but it was definitely a comedy :)

Couldn't finish it back then, and I can't find it anymore.

The American boy was blonde, I believe. There was an American woman there, with a Jeep?

There are some monsters and sword fights, but in a comedy manner. The monsters were like mechanical scarecrows, controlled by someone.
That sounds a bit like Labyrinth of Flames. (Ignore the plot description on that page; it's absolutely, utterly wrong. I just linked it for the extra picture.)



The main character is a Russian obsessed with samurai who's invited by a Japanese girl to her family estate, which is a big ninja mansion. She gives him a sword to seal their marriage since she wants him to defeat her rich fianc&eacute;. Her father is spending time with two sexy women who turn out to be ninjas in disguise trying to steal something from him. There was a blonde American cowgirl in a Jeep who I think was some kind of reporter, although she carried a gun (a revolver, of course). 

There was a ton of nudity and barely any plot. It sounds quite a bit like what you're describing.