A mentally challenged middle-aged lady living on the streets of Kolkata, meets another man of similar conduction. After the initial refusals from the lady, stubborn and intense, the man succeeds in winning the lady’s camaraderie. Soon, the socio-political consequences in the city affect their relationship and lead to their separation. The lady moves to the deserted fields in the out skirts, and find solace in her loneliness. Seasons change, and the man returns in search of the lady. Do they meet? The Rotten Apple is a tale of two diverse existences!