Two women named Nana meet on a train to Tokyo and become each other's reason to stay, even when everything they want pulls them apart. The show doesn't pretend love fixes anything, it just watches what happens when two people choose each other anyway, over and over, until one of them can't anymore. Every song on the soundtrack is a conversation they're already having.

Two women named Nana meet by chance on a train heading to Tokyo, and what begins as a random encounter becomes something neither of them expects. One Nana arrives in the city chasing romance, hoping to build a happy life with her boyfriend Shouji. The other Nana is all sharp edges and raw ambition, a punk rock singer determined to break through with her band Blast and win fame far beyond Japan. When they cross paths again while hunting for a place to live, they end up sharing an apartment, and their bond deepens as they lean on each other. Tokyo proves harsher than either imagined, and the struggles of love and career threaten everything they came to build. The result is a music-driven drama about romance and growing up in the big city.