This is the story of a woman who responds to an abused girl's silent cries of help. Nao, an aloof 30-something woman who works reluctantly as an elementary school teacher, notices the unmistakable bruises on her first grade pupil Rena. Initially, like everyone else, Nao looks the other way. But Rena's wretched desperation soon awakens a passion and determination in Nao. Together they skip town and embark on a risky journey pretending to be mother and child. "Mother" is the story of the transformation of a once disenchanted woman who suddenly takes on the role of a parent to a child who is starved for maternal love. The drama probes into the meaning of motherhood in modern society.