Nandanam movie is about Balamani(Navya Nair) who is the housemaid. Manu (Prithvi Raj) is a Bangalore-based software engineer who is returning home to bid farewell to his close ones before he leaves for his training trip to US. He is greeted by his dear mother Thangam (Revathi) and his darling grandmother (Kaviyoor Ponnama).
Here he meets Balamani and falls in love with her. Thangam fixes Manu's wedding with her friend’s daughter and when Manu confesses about his love to his mother, it is too late. To keep his mother happy Manu and Balamani decide to part.
Meanwhile Balamani meets Unni who is their neighbour who seems to know her innermost feelings for Manu and constantly assures her that miracles do happen.