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! As Blast gears up for their major label debut, their fan club starts mobilizing.

Led by the chic Shion, these ladies are serious fans who won't let anyone mess with their band. But the fan club has it out for Misato, a maverick fan who has gotten too close to Nana. What will they say when they find out Misato is applying for a job with Blast?!