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! Things aren't looking good for Blast.

Shin, under extreme stress from the band's rising success and his relationship with Reira, seeks out reconciliation wherever he can. Reestablishing ties with his own family turns out to be a horrible failure, and before he can connect Nana with her unknown little sister, Shin gets arrested! Is this the end of Blast?!