So Soft, So Cunning (1979)

Yuichi prides himself on the fact that he is a family man but contrary to his conception of an ideal family life, at age 24, his wife has already run out on him. In utter confusion, he tries to reason out where he had gone amiss that such a thing should happen out of the clear blue sky. About this time, Yuichi helps Ayako, a young girl, embroiled in trouble. She returns Yuichi's kindness by making off with his precious camera. Then she returns and since his wife has washed her hands of him, he forces himself on Ayako who acts as if she had been waiting for him to enter her. Suddenly, Yuichi's wife returns...