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.
Worried about Nana K.'s decision to live with a stranger, her friends drop by to make sure everything's all right--and meet a skinhead lawyer and Nana O. dressed only in a towel!
Shopping for their new apartment brings the Nanas closer together, as Nana K. gushes about Ren's band Trapnest, which brings back bittersweet memories for Nana O.
Nana O.'s musical ambitions are coming together as she recruits bassist Shin. But while Nana K. happily becomes the band's first groupie, is she forgetting to devote time to Shoji?
Short on cash and soon to be out of a job, Nana K. is down in the dumps--and unbeknownst to her, things might be getting a whole lot worse as Shoji is falling for his co-worker Sachiko...
Boosted by some money from her mother, Nana K. gains herself a "respectable" job with a publisher, while Shoji finds that it's not as easy to break up with Sachiko as he thought.
It's the evening of Blast' debut concert in Tokyo, and Nana K. does her best to drum up support for the band--but will her thunder get stolen by an ultra-cute groupie?
Nana K. has tickets to see the hot band Trapnest, but is Nana O. strong enough to accompany her and face her old lover Ren, who is performing in the band?
The Trapnest show is in full swing, and Nana K. hopes that Ren will see Nana O. from the stage. Will her maneuverings bring Nana O. and Ren back together?
Nana K. may have plotted to bring Nana O. and Ren back together, but that doesn't prepare her for an unexpected mahjong tournament at her apartment, and a chance to meet her idol Takumi from Trapnest!
Nana K prepares a feast in anticipation of Takumi dropping by after their show, but Takumi's at the after-party, making a shocking admission in front of Nobu and Shin.
Nana O confesses her worries about Takumi's womanizing to Yasu. Nana K, happily oblivious, pursues her relationship with Takumi, while Nobo works up the courage to reveal his feelings.
Blast is on the verge of getting a recording deal and prepare for a live show. Behind the scenes, Nana O decides to stay at Ren's for a while, leaving Nana K brokenhearted.
Nana K is torn between her affection for Nobu and her undeniable attraction to Takumi, but finds that Takumi's draw is irresistible, leaving Nobu feeling betrayed.
A producer invites Blast out to dinner after their live show, while Nana K prepares a feast at home, only to be let down and run straight to Takumi's arms.
Everyone is happy about Nana K and Nobu dating, especially Nana O. But Takumi is not so happy when Nana's cell phone rejects his calls, and Ren sees trouble ahead.
Reeling from the Nana K's news, Nana O runs to her usual source of comfort--Yasu. Nana K in the meantime runs to Junko and Kyosuke, and when she returns home, she finds Takumi waiting for her.
Nana O is disgusted to find Takumi at the apartment, walking around like he owns the place, and the general unrest deepens when Takumi reveals his and Nana's engagement to the rest of Trapnest.
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.
Nana O recovers from her collapse, and Blast's schedule becomes crammed. Nana relies on Yasu to handle the stress, but the image of Ren is always at the back of her mind.
Blast and Trapnest prepare to appear on the same show together, giving Ren an opportunity to ambush Nana in her dressing room with a shocking proposal.
Nana K is overcome with fan fever when she sees Blast's live performance on TV. Hoping to reconnect with Nana O and apologize to Nobu, she texts Shin with an invitation to a fireworks show.
Yasu gets permission from their manager for everyone to attend the fireworks show. Disguised to protect themselves from ardent fans, the band members wait in apt. 707 for Nana K.
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.
