Nana Osaki's band Blast is taking off in a big way--from sold-out club dates to a record label waving a contract at them. But the Trapnest menace still lurks, stealing away everything she cares for. Trapnest took her boyfriend, and even though Ren is back in her life, his band still comes first. And now her trusty sidekick Nana K. is being lured away by Trapnest bassist Takumi. But this time, Nana O. won't give up without a fight!

Nana K. is going home--for an awesome TrapNest concert! She drags Nana O. along, convinced that somehow Ren will sense his ex-flame in the audience. But life is never that easy, and Nana O. isn't sure if she even wants Ren back. As for Nana K., is she prepared for TrapNest to come down off the stage and into her life, or will her fan-girl attitude land her in a heap of trouble?

Being an engaged woman isn't as wonderful as Hachi thought it would be. She has a trendy new apartment, but she's isolated from all her friends and Takumi is hardly ever home. When scandal hits Blast hard, Trapnest (and her fiancé) flee to Europe and Hachi is left to watch Blast suffer in the scandal rags and tabloid shows.

Nana K.'s perfect Tokyo life is crumbling around her. She can't keep a job, she can't keep any money, and now it looks like she can't even keep her boyfriend! But luckily, a tasty nugget of gossip about Nana O.'s past love life helps Nana K. keep her mind off her own troubles. If she can play the role of cupid for her best friend, can Nana K. get closer to her own happy ending?

奈奈與拓實閃電註冊入籍。可是娜娜卻因承受不住這個消息所帶來的孤獨感，而在蓮面前陷入慌亂之中。兩人滿懷不安地搬進新居，但是…？

This is the story of two 20-year old women who share the same name. Even though they come from completely different backgrounds, they somehow meet and become best friends. The world of NANA is a world exploding with sex, music, fashion, gossip, and all-night parties.