Suspended cop Vivek Gopinath rejoins after gambling scandal. Tasked with solving 40-year-old murder case with faceless victim, he seeks redemption by cracking the long-unsolved mystery.

Strange events unfold in a monkey-inhabited village, prompting a newlywed pair and forest officials to embark on a mission to uncover the root cause of the peculiar disturbances.

At a bustling bus stand, two men from contrasting social strata cross paths. One basks in affluence, the other grapples with life's challenges. Together, they embark on a journey laced with humor and unexpected adventures.

The story of 'Otta' is inspired by the life of S Hariharan who has written the book 'Runaway Children', which was based on the life of S Hariharan.