Twenty-fouryearsbeforewinninganAcademyAwardforhisaffectingmusicaldramaDepartures,directorYojiroTakitatookthehelmforthisquirkyPinkueigaaboutaveterandetectivesearchingforapricelesspearl.Theworld'slargestblackpearlhasvanishedwithoutatrace,andit'suptoDetectiveIppeitotrackitdown.Hisonlyclueisthemysteriouswordsofadyingman,whomanagedtomutter"PussyPrint!"beforeslippingawayforever.Teamingwiththeman'syoungerwidowMatsuko,DetectiveIppeiboardsalocaltrainandbeginstakingprintsofthefemalepassenger'svulvasinhopesofmatchingonetotheprintthatMatsuka'shusbandhadinhispossessionatthetimeofhisdeath.Thisfilmisalsoknownas"ChikanDenshaShitagiKensatsu"