Gattu is a 23 year old middle class boy from Lucknow who is in love with his neighborhood crush Binny (20) since his childhood days. However, his family members believe that all girls of the mohalla are like one's sister and hence, Binny too has been accorded Gattu's sister since the day they were kids. Gattu, though, doesn't believe in this 'behen-bhai ka pyaar' definition. He knows this is his age is to do 'girlfriend wala pyar' and he will convince both firebrand Binny, who is famous in tying rakhi to every boy of the mohalla, and their family members that Binny will none other than his life-long love.

Supporting him in his daredevil venture is Gattu's closes friend Bhura, who belongs to quite a notorious family of the town. Gattu begins to work in Binny's elder brother Jaidev's Jagran mandli and manages to win over Binny's heart, but is stumped when Jaidev fixes Binny's marriage with France-returned Rahul. To make things worse, Gattu's family suspects that Binny is having an affair with Bhura, and informs Jaidev about it. Gattu lacks the courage to speak the truth to Jaidev and as the misunderstanding grows, an angry Jaidev slaps Bhura.

The incident enrages Bura's family against Gattu's mohalla while Binny is pissed with Gattu for not having the courage to stop the spreading rumors or ask her hand in marriage from Jaidev. Bhura's father decides Binny to be his daughter-in-law in one look and Gattu is left in a jiffy as now instead of him, it is either Rahul or Bhura who are both in line to marry Binny.

Will Gattu find a way out to make Binny forgive him for his mistake and right the wrong he has done? Will he be able to avoid the brewing war between Bhura's notorious gang and his shareef Mohalla as the wedding date approaches? Above all, will he be able to convince his family and mohalla members that Binny is his nikkar ke zamane ka pyaar and Behen Hogi Teri!

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