Nana Komatsu is on her way to Tokyo; now she can finally be with her boyfriend after a year of dating long-distance! On the train there, Nana Komatsu meets Nana Osaki – a girl who shares her name but seems to be everything Nana Komatsu is not; cool, street-wise, and a punk rocker. The two hit it off and spend the entire journey getting to know each other, but when they get to Tokyo, circumstance separates them seemingly forever. However, fate is not finished with these two. Whilst hunting for a place to live the two Nanas again cross paths. They decide to share a flat and become best friends in no time. Nana K. must learn to be independent and mature, while Nana O. works on becoming famous with her band; but together, they will learn about love and loss, and the growth that comes with it.