ナナたち『ブラスト』はデビューに向けて、練習の日々。一方奈々はノブとの恋が、一気に盛りあがり幸せな日々を送り始めていた…。ところが、そんな時奈々に…！？

平安夜，住在大阪的上原美里也出席的感恩會終於順利的結束了。另一方面，知道娜娜的媽媽還活在世上的奈奈，衝動的前往大阪，但是…！？

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?