Living with her stepfather while enduring hardship and waiting for her mother's return, daughter Fujimura Natsumi spends her days working part-time jobs to support the household after her mother is imprisoned. However, her stepfather drowns himself in alcohol, monopolizes Natsumi's earnings, and drives the family toward ruin. One day, debt collectors arrive at the house. Unbeknownst to Natsumi, her stepfather had been secretly working at an illegal casino, squandering the money on gambling. To repay his debts, he decides to sell Natsumi. Her fate takes a drastic turn because of this incident.