Nana Komatsu is moving to Tokyo to start a new life with her boyfriend--and as chance would have it, she is about to meet a woman the same age named Nana Osaki, with the two Nanas destined to share an apartment...
A look into the teenage years of Nana Komatsu in her home town: her friendship with schoolmate Junko Saotome, her faculty to easily "fall in love" with older men, and her troubled relationship with her first love. Also, how she meet her current boyfriend, Shôji.
Nana O is ready at last to see Nana K again, but is turned away at their building as a stalker fan! Nana K is actually only steps away at a coffee shop with Shin, who tells her to stand by her decision.
Nana O and Ren suddenly find themselves in the spotlight when their relationship becomes fodder for the entertainment media. Everyone's on edge, including Takumi and Nana K, who have their first fight.
With Nana K and Takumi's wedding two weeks away, both Nana K and Nobu are nervous about seeing each other, but Nana O is determined to bring them together at the fireworks show that the band is attending in disguise.