Was it a movie or a series?

Two-part OVA.

Serious or comedy?

...ecchi comedy ^^;  I think this review 
about sums it up ^^;

Since the OVAs were so short, Miyuki-chan cels 
tend to be slightly expensive, but I've yet to 
see a price on them that makes my eyes bug out 
*crosses fingers* ^^

Here's anothe
r site that has lots of Miyuki-chan 
information.

Also, you may be interested to know that the 
manga is going to be re-release in Japan on May 1.