Nana

Two very different 20 year old women meet on a train to Tokyo. Other than the fact they're both named Nana, they have very different pasts and personalities. Despite this, they're destined to become very big parts of each other's lives. 

Based on the very popular anime and manga of the same name, this is a fun adaption. The musical aspects of the story are kept, and are as nearly as important to the story as the relationship between the two Nana's. Speaking of, the actresses chosen to play the two title characters are great, and the story is as interesting for guys as it is the girls who are the original audience.

NANA was a good movie, I liked it. Obviously it's more recommended for people who are already familiar with the source material, but even NANA newbies should enjoy this.