In 1952, in a village in Konkan, a boy named Gotya is obsessed with Munni, a neighbour seven years older than him. After a failed attempt to harm her suitor, he undergoes his munja ceremony while Munni is married off. Desperate to marry her, Gotya decides to perform a human sacrifice ritual beneath a peepal tree in the Chetukwadi forest, using his sister Gita as the intended victim. However, Gita escapes, and Gotya accidentally kills himself. His remains are buried beneath the tree to contain his vengeful spirit, which manifests as a supernatural entity called Munjya. In present-day Pune, the timid young Bittu works at his mother Pammi's beauty salon and shares a close bond with his grandmother, Gita. Heartbroken by the engagement of his childhood friend and crush, Bela, to her English companion Kuba, Bittu and his family travel to their ancestral village for his cousin Rukku's wedding. There, Bittu overhears a conversation between Gita and his uncle Balu about his late father's mysterious death, which is linked to the haunted peepal tree. Disturbed, Bittu visits the tree and inadvertently releases Munjya. Back in Pune, Munjya begins haunting Bittu, insisting that he arrange a marriage with Munni or Pammi will be harmed. Bittu confides in his cousin Spielberg, and the two learn from Rukku that Munni is Bela’s wheelchair-using grandmother. Upon seeing Bela, who resembles a young Munni, Munjya shifts his obsession to her, planning to marry her by performing a ritual that involves transferring his soul into a goat (Parakāyapraveśa) and sacrificing Bela beneath the same tree. Following advice from an eccentric exorcist named Elvis, Bittu, Spielberg, Pammi, and Bela travel back to the village under the pretence of filming an advertisement for Bela’s Zumba centre. Kuba also arrives but is attacked by the jealous Munjya. On the wedding day, the group transfers Munjya's soul into a goat by drawing a mystical symbol on its head and attempts to behead it to destroy him, but a drunken Bela draws the same symbol on her own forehead, causing Munjya to possess her while her soul enters the goat. As the possessed Bela attacks the group, Balu abducts the goat and presumably cooks it, allegedly transferring Bela’s spirit into him. Elvis draws the symbol on Balu's forehead to help Bela's soul return to her body, but it is revealed that a different goat was slaughtered. Munjya then possesses Balu, while Bela’s soul returns to her body. Bittu and Bela flee but are pursued by the possessed Balu. Guided by Gita’s spirit, Bittu overcomes his fears and subdues Munjya by trapping him within the peepal tree and setting it ablaze. Later, Bittu confesses his love to Bela, but she prefers to remain friends. The final scene shows burnt logs from the peepal tree being transported elsewhere, hinting at Munjya’s lingering presence. In a post-credits scene, Bittu's friend Bhaskar is seen stranded naked in the forest, inadvertently attracting Munjya’s attention after Jana brings him clothes from the "Munni" brand.