Thiraviyam's defiance over his sister's marriage
In an Iraniyal Chettiar household, the young grandson Thiraviyam watches his sister Nagu suffer after a marriage arranged strictly by caste custom fails and leaves her with no sanctioned way out. The elders, speaking for the community, treat her ruined life as the acceptable price of keeping the rules. Thiraviyam comes to reject that verdict and act against the elders on her behalf, which makes the family's private crisis a direct test of whether one generation can break with the customs of the previous two.