Hachi's happiness with Nobu is slipping through her fingers as an unexpected complication with Takumi threatens to upend her entire life. And unlike her past romantic woes, the choice she makes now will change the lives of everyone around her.

Nana K.'s perfect Tokyo life is crumbling around her. She can't keep a job, she can't keep any money, and now it looks like she can't even keep her boyfriend! But luckily, a tasty nugget of gossip about Nana O.'s past love life helps Nana K. keep her mind off her own troubles. If she can play the role of cupid for her best friend, can Nana K. get closer to her own happy ending?

奈奈與拓實閃電註冊入籍。可是娜娜卻因承受不住這個消息所帶來的孤獨感，而在蓮面前陷入慌亂之中。兩人滿懷不安地搬進新居，但是…？

This is the story of two 20-year old women who share the same name. Even though they come from completely different backgrounds, they somehow meet and become best friends. The world of NANA is a world exploding with sex, music, fashion, gossip, and all-night parties.

奈奈終於開始明白屬於自己的幸福形式。另一方面，正在地方巡迴中的娜娜，積極安排提交自己與蓮的結婚登記書。就在此時，娜娜收到了蓮與雷拉的震撼性照片…？

為了讓自己不去想生日的事情，娜娜努力接工作，讓工作佔滿所有時間。另一方面，因為可以跟蓮一起去找娜娜，而興奮又期待的奈奈，卻收到了造夢也沒有想到的消息——！？