The film focusses on a family living in Kolkata whose head is Ram Shibo Prasad (Victor Banerjee), a retired head master. He is a disciplined person and always tries to make his relatives behave in the same way. To avoid bad remarks from the society about his family, he sets up a family constitution of discipline. His mania for discipline is such big that if any one of his family members commit 100 Mistakes, that person would be banished from the family and that mistake can be anything which Shibo Prasad hates which includes laughing out loudly. Thus all of the family members maintain a disciplinary life to avoid being banished from the house. In detail, the family consists of Shibo Prasad’s wife Aparna, an Asthma patient; his daughter Kavita, his son in law Vikas and their kids. Apart from them are Shibo Prasad’s two sons Ananada (Saheb Chatterjee) and Raktim Prasad (Dev). Since Shibo Prasad’s brother Ram Prasad (Shankar Chakraborty) was alleged to be committed 100 Mistakes though he didn’t, he is sent away from home. While all of the family members commit mistakes less than 20, Raktim commits 99 Mistakes and one more, he is out of the family. So to avoid that Raktim starts leading a careful life. Ananda’s marriage is scheduled at New Jalpaiguri and the whole family boards Paharia Express at Howrah. Raktim’s mother forgot the Sindor at the house and Raktim goes away to bring it back. Moreover, to his convenience, Raktim is in S4 while others are in S3. So Raktim goes outside the station and waits for an Taxi, But none accepts to go to his area. Meanwhile, a miser techie Neelasha (Nusrat Jahan) reaches Howrah railway station to board the Paharia Express and the taxi driver goes to bring the change in order to pay her off the balance amount after receiving the fare. Raktim gets into the vehicle and goes to his home. He breaks the house’s lock with a stone as he has no keys to open it. He takes the Sindoor and goes back to Howrah Railway Station. Neelasha catches yet another Taxi and reaches to the station. There she pays off the fares of both the vehicles and goes to board the train.