NAACH tells the story of two characters - Rewa [Antra Mali], a wannabe choreographer and Abhi [Abhishek Bachchan], a struggling actor.

Rewa and Abhi are both trying to get a foothold in the industry. Abhi is lucky to get a break, while Rewa is shown the door since the lead actress wants her fav choreographer in the film. Things reach a stage where Abhi and Rewa go separate ways due to ideological differences. Abhi becomes a big star, while Rewa continues with her struggle. She finally manages the big break when a music company boss, Diwakar [Ritesh Deshmukh], offers her a video, as an actress. There's no looking back, Rewa becomes famous overnight.

Abhi and Rewa meet again, this time in a restaurant. There's uneasiness. The same night, Abhi confesses to Rewa that he still loves her. But Rewa turns down the offer.

Diwakar now wants to start a musical film and he approaches Rewa and Abhi for the main roles. What happens next?

NAACH is about Abhi and Rewa's principles and their outlook towards life. How those principles throw a spanner in their lives forms the crux of the story.