Nana Komatsu is on her way to Tokyo to meet her boyfriend. An event that she's been longing and saving for since a long time. On board the train, the vacant seat she occupies is beside a cool-looking, punked, but pretty girl. When the train abruptly stops because of the storm, Nana and the girl hit it off and have a long conversation (most of the talking from Nana herself).

She soon finds out that the girl sitting beside her is also named Nana! Nana Osaki is heading to Tokyo to reach her dream of becoming a musician. Nana Komatsu feels as if it was fate and gets even more excited about their encounter. However, when seeing her boyfriend Shouji, she becomes oblivious to Nana Osaki's leave.

Fate strikes again when they search for a place to live. They both love this one apartment that's cheap with a modern touch. They then decide to live together, despite their differences.