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...
Nana K. has quite the dating history with men, but when she falls for one of her girlfriend's buddies, is the relationship for real, or just another case of fleeting "love at first sight?
Nana K. and Shoji have made a "declaration of friendship," but their growing relationship is strained when Shoji decides to move to Tokyo.
Nana O. is a musically talented loner who is about to have her world turned upside down as her guitarist boyfriend Ren ponders a change of scenery.
Ren is committed to hitting the big time as a musician in Tokyo, but is Nana O. content to come along for the ride, or stake her own claim to fame?
A chance encounter on a train brings Nana K. and Nana O. together, and another chance meeting leads to them sharing the same apartment.
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.
When one of Nana O.'s old bandmates drops in for a visit, an impromptu music session becomes Nana O.'s first unofficial Tokyo concert.
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.
While Nana K.'s friends try to steer Shoji away from Sachiko, Nana O.'s band Blast sets up its first gig, and Nana K. has an unexpected meeting with Sachiko.
A surprise visit by Nana K. to Shoji's workplace results in an unwelcome surprise for Nana K. when she sees Shoji with Sachiko.
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?
A trip to Nana K.'s hometown turns into an eye-opening visit with Nana K.'s family for Nana O., and a chance to reunite with her old love Ren.
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!
As Nana K. gets more involved with the intertwined personal histories of the bands Trapnest and Blast, she risks losing something important - her job!
While Nana K. falls prey to the charms of Takumi of Trapnest, Nana O. discovers that someone else has feelings for her fickle roommate.
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 Nobu 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.
Nana K. wants someone to love for the rest of her life, and she begins to think it won't be Takumi. Then she and Nobu share a moment alone...
Nana and Nobu fall in love under the stars, but the shadow of Takumi still lingers between them, unless Nana can make the final break.
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.
Nana O. is worried about Nana K., Misato is worried about Blast's contract, and Nana K. is worried about a possible pregnancy!
Misato and Nana O. worry over Nana K. When Shin reveals details of his family's past, Nana O. and Nana K. launch into a discussion of motherhood.
Takumi surprisingly steps up to take responsibility for Nana's pregnancy, but Nana O. is devastated and Nobu heartbroken.
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.
A brokenhearted Reira has rushed to Yasu for comfort, sending the recording studio in an uproar at her disappearance.
Nana O. stays away from apt. 707, but unknown to her, Nana K. has moved into a luxurious new apartment and is spending her days knitting for the baby.
Takumi and Nana K. are blissful in their new apartment, but Reira is torn apart by the engagement, prompting Shin to rush to her side.
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.
While Blast deals with the repercussions of the media attention, Nana K. makes up with Takumi, only to discover he's going away-to London.
Takumi returns from London and prepares to meet Nana's parents, while Ren ponders if he can ever love Nana O. the way that Yasu does.
Blast records at a training camp, while in Nana K's hometown, Takumi charms and is charmed by the Komatsu family.
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.