AftertheGreatEarthquakeinNortheasternJapan,Mitsuoissenttoamentalhospitalfromthestrainofgrieffromworkingtoclearoutthedebrisofthedisaster.Whenheisreleased3yearslater,hefeelsamomentofhappinessasheiswelcomedbackbyhisbrotherYuta,hiswifeYoko,theirfirstdaughterChie,andtheirseconddaughterItsuki,whohasadownsyndrome.Thenextday,Chiewishestogototheamusementpark,andMitsuotakesChieandItsukithere.Butthesehappymomentsdon'tlastlong,andtheincidenthappensatthepark.ChiedroppedItsukiontheconcretewhenMitsuotookhiseyesoffofthem.YokocannotacceptItsuki'sdeath,madlyquestionsChieandMitsuo.Inthispressure,Chieliesthat"UncleMitsuodroppedItsuki."AsYokogoesthroughamentalbreakdownfromtheshock.Becomingfullwithregretdaybyday,YokoaccusesYutaandquestionsifhefeltrelievedthatItsukidied.Hearingthisfightbetweenherparents,Chie'sheartwasalsoslowlybeing...