First up, there's Osaki Nana (Nakashima Mika), a calm, cool, and collected punk rock singer who struts into Tokyo's underground punk scene looking to hit the big time. While Nana's got some ex-boyfriend issues that she's eager to put behind her, she won't allow that personal drama to interfere with her big dream. In fact, Nana's not going to stop until she's conquered Japan as the nation's top rock star! The other "Nana" of the title is Komatsu Nana (TV actress Miyazaki Aoi), who is alternatively called Hachi. Cute and cheerful, Hachi led a somewhat sheltered life and has a bad habit of falling in love too quickly. She had some relationship problems in the past, but when she falls for her high school pal Junko, she decides to follow him to Tokyo when he gets admitted to an art design school. By moving to the big city, she hopes to find love and happiness in this new locale.