A chance meeting on a train to Tokyo sends two girls named Nana on a collision course with destiny! Nana "Hachi" Komatsu hopes that moving to Tokyo will help her make a clean start and leave her capricious love life behind her. Nana Osaki, who arrives in the city at the same time, has plans to score big in the world of rock'n'roll. Although these two young women come from different backgrounds, they quickly become best friends in a whirlwind world of sex, music, fashion, gossip and all-night parties! Hachi was happy to be Blast's biggest cheerleader, but now that the band is taking off, she's discovering that there are hordes of fans eager to take her place.

At the same time, her involvement with Trapnest hottie Takumi is turning into a romantic entanglement she hadn't expected. When a chance for another kind of happiness presents itself, will Hachi be strong enough to face the difficult choices that result?