Three years after losing her husband, mother Eriko has grown accustomed to living alone with her only son, Koichi. One day, as her days were going by peacefully, an unbelievable sight caught Hitomi. Her housewife friend Fumie and Koichi were half-naked and embracing each other! It felt as though her beloved son had been taken away by a stranger... and what's more, it was an old friend she trusted. The sadness and anger of feeling doubly betrayed drove Eriko to take an unexpected action...