Raja Bhai Lagey Raho is a comic caper of a private detective named Raja. Raja Srivastava (Ravi Kishen) comes to Mumbai to become a Bhai who helps sort out people's personal lives.
However, he mostly gets clients who ask him to keep a record of their spouses. As Raja exposes the various extra-marital affairs, skeletons are laid bare. However, his attempts often create more confusion than solving the problem!