Mistress Spirit (1999)

Novelist Uehara has a wife and children. Uehara and Naomi were having an affair. That summer, the two were meeting secretly at Uehara's villa. He promised to leave his wife. Naomi wished to have a child. For Naomi, it was a fleeting moment of happiness... Then his wife unexpectedly arrived. His wife, who had seen through everything, had come with the intention of breaking them apart. And then the unfortunate accident happened. The struggle between his wife and Naomi escalated. A knife pierced Naomi as she fell. Uehara was distraught by the flowing blood. But his wife restrained him and buried Naomi to cover up everything.