Sisters Asuka and Aya lose their parents in an accident and are suddenly burdened with overwhelming debt. Asuka drops out of school and starts working as an office clerk at a factory run by their landlord, relying on Aya to help pay off the overdue rent. One day, the landlord's son suddenly appears, demanding immediate payment. When they can't pay, he tries to forcefully take advantage of Aya's body—but everything changes when Asuka returns home and interrupts the scene.