Attempting to kickstart his career, Karthik makes a documentary on Alzheimer's disease. His subject, Malathi Menon, lives in a small town outside Harippad with her daughter Athira. Karthik and his team arrive at Malathi's place and start noticing Malathi's unexplainable behavior, where she starts speaking in an ancient language and scribbling on certain pictures.

Oshana takes you through the journey through the life of a guy named John, where you see how the people around him and his love stories shape everything. Each romance brings unexpected twists and turns, making it a real rollercoaster ride. It's a film that captures all the drama and excitement of love and life in a way that'll keep you hooked.