Funny movie!
I've seen the show and I do read the manga. I don't think Kaiba was the gay one (*cough*Yugi*cough*), he could just never get a girl! :o
I really liked your animation. You have talent! But there were some moments where the screen became a little messed up, but that's okay.
Now, the sound is the only reason I don't care too much for this movie (if you fixed it, this movie would be great!). Especially when Kaiba is talking to his mother. Try to record his mother's voice a little better (you don't have to put your mouth right next to the mic). Also, I wasn't able to hear Kaiba's voice too well either.
Your music choice... could have been better. I get it, Kaiba is supposed to be gay, but I think you can find better music to support that than Britney Spears (but it does seem to fit).
Like I said, this was a funny movie. Poor Kaiba; all he wants to do is dance! :'(
Nice job, just fix the sound and some of the animation.