Nandini, a college student, is the sole niece of four brothers who guard her with a close, protective bond: Ramankutty, Achuthankutty, Shankarankutty, and Keshavan Kutty. They live near her campus in a women’s hostel, and their watchful presence earns them the playful but formidable nickname Hitler brothers from the neighborhood. Nandini’s life feels steady under their care, even as she encounters the flirtations of peers, all while the brothers keep a protective eye on her future.
To secure that future, the brothers decide to arrange a marriage to a wealthy doctor, Gopan. Nandini agrees to the arrangement, but it soon becomes clear that the match is about more than affection: Gopan’s interest appears tied to Nandini’s property, not just the person herself. The matter centers on a property Nandini owns that is leased to the Kerala Police for use as a police station. The brothers press to use this asset as part of the dowry, and in the turmoil, they even call in the police to vacate the premises. Head constable Bhaktha Valsalan, misunderstanding their aims, reacts physically, escalating the conflict and pushing the family toward legal recourse.
Seeking a peaceful, lawful path, the brothers consult advocate Manmadan and begin a legal fight to protect Nandini’s rights. A new sub-inspector, Sundaran, moves into the area, living across from Nandini’s hostel with his father and sister. The family serves a formal legal notice to Sundaran, demanding the police station be vacated, and the tension between law and family loyalty grows sharper. In parallel, Manmadan’s own feelings slip into the equation: he develops an attraction to Nandini, who teasingly redirects his love letter to Sundaran’s sister, Sundari, sparking a bond between Sundaran and Sundari.
Tension peaks when Gopan invites Nandini to a hotel room to pressure her into a physical relationship. She makes her disapproval clear, and when Sundaran’s squad arrives, he intervenes decisively, rescuing Nandini and making his disdain for Gopan plain. Yet Gopan uses manipulation to turn the brothers against Nandini, suggesting she misunderstood him, which deepens the rift.
As the romantic lines become clearer, Nandini and Sundaran grow closer, while Manmadan keeps writing to her, including distressing hints of despair that she redirects to Sundari. Sundari steps in to help, even saving him from a dangerous situation on a moving train. With limited options, Manmadan agrees to marry Sundari, and a new in-law dynamic forms: Manmadan and Sundaran become friends, and at least for the moment, Manmadan withdraws from representing the brothers against Sundaran.
Enter Narendran, Nandini’s step brother, who arrives to lay claim to her properties. Narendran teams up with Manmadan to support Sundaran’s effort to see Nandini’s happiness realized—while uncovering the truth of her coerced engagement to Gopan. As the danger escalates, Gopan gifts a bomb to the couple, oblivious to the consequences. The Hitler brothers learn of the threat, and with the help of Narendran and CI Thrivikraman, a race against time unfolds to save Nandini and Sundaran. In the end, Gopan is arrested, and the fragile alliance between love, family, and the law is tested and tempered by the events that follow.