MAZAA MAZAA revolves around a 15-year-old girl Jassi, who feels that she's not good looking or happening. She always complains of being young and not able to do things that are being done by her elder friends, like going to discos, wearing flashy clothes and looking beautiful.

Monica, her rival in school, is modern in her outlook and can make things happen her way. Jassi's only sympathizer is her fat, ever-loving friend Rocky.

Due to some unusual circumstances, Jassi's dream of growing big and beautiful comes true and along with her friend Rocky and rival Monica becomes 25 overnight. How the 15-year-old Jassi, with a physical figure of 25, faces world at large forms the crux of the story.