Naagin 4 starts with the scene of a couple exchanging vows in the middle of the desert. A sandstorm approaches. Maanyata tells Keshav (Shaleen Bhanot) that she will fight every obstacle that comes in front of him. A number of snakes come there and the priest vanishes. A big five-fanged serpent is also seen. The woman prays to the Lord Shiva. Slowly, she transforms into a Naagin. The guy is shocked. He tells not to fight her own family. Her parents say that she has no right to love a human man. They say you are a Icchadhari Naagin. They remind her that she will lose all her strengths on the day when the moon coincides with the Ashlesha Nakshatra. She tell her that her child will also be a Naagin. Maanyata (Sayantani Ghosh) defies them to marry Keshav. They tell her that she has broken the traditions of Naag Lok. They tell her that Lord Shiva will punish her robbing her of all the powers. The couple leave the place and consummate their marriage. After a year, they're blessed with a girl child.
A man, Akashbhai comes to Keshav and Maanyata. In an abandoned dungeon, we see Nanabhai's family being held hostage. Vaishali tells a man that it is bad news that Keshav is coming home. A man tells Nanabhai to reveal the mystery of the temple on the red hill (Laal Tekdi). It is the Parekh household. Everyone tells grandmother to rest as she has to talk to Keshav. Vaishali tells a man that we need to find out the mystery of the Shiv Temple on the red Tekdi. It is possible only when the moon is in the Ashlesha Nakshatra. Keshav's father says I will never reveal the secret. They threaten to finish off Keshav and his child. They tell Nanabhai they want to see how his Bahu manages to save the family. Nanabhai pleads to Vaishali. They decide to finish him off.
On the road, Keshav and Maanyata get accosted by Vaishali and Akashbhai's family members. He sees his family being held hostage. The men attack Keshav. Maanyata comes into her Naagin form. The moon comes into the Ashlesha Nakshatra and she loses all her Naagrani powers. Vaishali tells Maanyata about the curse given to her by her mother. They kill Keshav's family members including the children. Maanyata manages to escape towards the temple on the Laal Tekdi. She prays to Lord Shiva to save her infant. Vaishali and co. come there. The priest tell them that they cannot kill anyone in the temple. They chase down Maanyata who is fleeing. She comes close to a waterfall. Maanyata jumps off and says she will take revenge. The infant also sees the Parekh family members.
Vaishali tells her husband Akash Bhai that robbers have killed off Nanabhai's family members. A group of villagers rescue Maanyata and her child as they come ashore. They wrap the baby in a towel. Maanyata snatches away her child and says she has to prepare for her destiny. She says my daughter will avenge my tragedy. She names her child, Nayantara. She says my child will be a Naagin who will never forget her revenge.
The story moves 25 years ahead. Vaishali tells everyone to get ready for a puja. The kids want to have fun. People are talking about the marriage of Manas. Daadi says it is only my Dev and Vrinda who remember my birthday. We meet Dev who is a businessman in Qatar. Near the Laal Tekdi, we meet Nayantara (Jasmin Bhasin), the daughter of the Naagin. Vaishali says 25 years are over since we killed that woman near the Laal Tekdi temple. She asks where is Dev. He is in Qatar. Dev's (Vijayendra Kumeria) brother Rohan is getting beaten up in a boxing ring in Qatar. He reaches there for him. Dev blasts Rohan for gambling.
The grandmother asks why is the Puja. They say it is save him from the influence of the Ashlesha Nakshatra. Vaishali tells Dev - Rohan to stay in Qatar. She warns them about the Nakshatra. They wish Baa, the Daadi. Vrinda (Nia Sharma) walks with a cake for Baa. Nayanthara swears she will ruin the Parekh family. She says will finish them one by one.
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