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