A Full-up Train

Tamio Moroi graduates from a prestigious university and obtains a job at the Camel Brewery in a distant town. He is keen to work hard, but is warned to take it easy and just appear as if he were working. He receives a letter from his father saying that his mother is going crazy. After hiring a psychiatric student from his university to investigate his mother, she comes to visit him to tell him that it is really his father that is going insane... (imdb)