I'll be honest, the first episode of NANA got me right away. Two girls named Nana end up on the same train to Tokyo, and they couldn't be more different. Osaki is the punk singer who looks like she'd rather be anywhere else, and Hachi is the bubbly one chasing her boyfriend and a dream of the "perfect" life. Nothing big happens, and that's why it works. You just sit in that train car and feel the chemistry. By the end you already want to see these two figure each other out. It also tells you what kind of show this is, just about two people trying to make it in a city that doesn't care about them yet.