 Saraswathi "Yamuna", the younger daughter of an Orthodox father, comes to Madras for finishing her studies.Major Madhavan, the husband of Yamuna's elder sister Ganga, gets infatuated with Yamuna after seeing her photo in a letter sent by her.Meanwhile, Yamuna meets Jeevanantham "Jeeva" in a bus, who gives his ticket to her as she had not taken her own.