Aaina is a story of two sisters. Roma Mathur (Amrita Singh) and Reema Mathur (Juhi Chawla) who fall in love for the same guy Ravi Saxena (Jackie Shroff). The sisters have opposite personalities. While Roma is confident and blunt, Reema is shy and sensitive. Ravi however fall's for Roma and they decide to get married. Reema is heart broken by this development. Roma pitches Ravi on the day of their wedding for a modelling career. Ravi marries Reema instead and as they are setiling down in their relationship Roma comes back she tries to steal Ravi from Reema by seducing him with her charm. Will Ravi succumb to her tactics? Will he leave Reema for Roma? Will Reema's love win over Roma? This development forms the remaining part of the movie.