During the war, the Arita family on the outskirts of Tokyo
Yukiko lost her beloved husband Seiryu in an unexpected accident.

Her husband's will contained information that was difficult to understand.
He plans to hand over the headship of the family to her brother-in-law, Yasutaka, who has mental problems and is imprisoned in a prison cell.

After taking over as head of his family, Yasutaka begins to show an abnormal obsession with Yukiko...