Lady Karuizawa (1982)

Junichi, a poor student gets off at Karuizawa Station, the popular tourist spot in order to mix in with the upper classes. He starts his part-time job at a high-end restaurant where rich guests gather. At one party he drops a silver plate and Genichirô blames him, only his middle aged beautiful wife, Keiko covers Junichi, but he is fired from job. The next day he meets Keiko and her 5-year-old son, Yuichi at a restaurant. She is rich but lives lonely life away from her husband who lives with his mistress. She hires him as a tutor for her son. He soon seduces her and a secret love affair between an upper class woman and a poor young man develops in the summer resort. But when her son falls in pool while they are having sex, she fires him. But this time he is hired by her niece, Yôko.