Nana Kōmatsu and Nana Ōsaki, both 20, meet on a train to Tokyo. They end up sharing an apartment and navigating their love lives and careers in the city.

Nana Ōsaki is a punk rock vocalist trying to debut her band, Blast, in Tokyo where her ex-boyfriend's popular band, Trapnest, plays. Nana Kōmatsu is going to Tokyo to see her boyfriend, Shōji.