Kaccha Limbu is set in the 80's where Katdare and his wife Shaileja live with their mentally unstable son. While Katdare works perpetual night shifts at the telegraph office, Shaileja works for a private company. Their son, Bacchu, is now 16 years old and his growing age and sexuality are a cause of concern for this couple, especially the mother. Katdare tries to find the solution for his problems in death, while Shaileja, in her quest for happiness, finds herself drifting towards her benign boss, Pandit.
The story beautifully portrays how the couple, who is on the verge of getting lost in the quagmire of their circumstances, fight their way back to sanity and togetherness.