What Did the Lady Forget?

In Tokyo, Professor Komiya and his wife Tokio care for Setsuko, their spirited niece from Osaka. Setsuko, a rebellious youth, smokes despite being underage. One weekend, Tokio insists the professor play golf, but he ends up at a bar with Setsuko instead. After she drinks too much, he asks his student Okada to take her home while he stays at Okada's place. Tokio becomes suspicious of Setsuko and questions her husband's whereabouts upon learning he didn't go golfing.