Nana Komatsu, a high school girl driven by romantic pursuits despite repeated setbacks, remains optimistic as she embarks on a train journey to Tokyo at 20 to reunite with her boyfriend. In contrast, Nana Osaki, a spirited young woman with a passion for music, faces a crossroads between love and her musical career, ultimately choosing the latter as she heads to Tokyo to pursue her dream of becoming a renowned vocalist. These two girls, sharing the same name but distinct dreams, serendipitously meet on the train to the city and eventually become roommates. Bound by a profound and exceptional friendship, they navigate a tale of love, music, camaraderie, and heartache together.