Anaffluentmedicalprofessor,Komiya,andhisbossywife,Tokio,aretolookafterSetsuko,theirhigh-spiritedniecefromOsaka.Setsukoisaliberatedwomanwhodoeswhatshewants,includingsmoking,eventhoughsheisaminor.OnSaturday,theprofessordoesnotfeellikegoingtohisweekendgolfgame,buthiswifepackshimoffanyway.SoheleaveshisbagattheapartmentofhisstudentOkada,andgoestoabarwithafriend.Setsukotraceshimthere,andinsiststhathetakehertoageishahouse.Whenshegetsrathertipsy,theprofessorcallsOkadatotakeherhome,whilehesleepsatOkada's.ThewifebecomessuspiciousofSetsukowhensheseesOkadabringingherhome,andalsoofherhusbandwhenshediscoversthathedidnotgogolfing.