Theworldisdividedintotwoparts:'TheBuildingcity'wheretherichlive,andthe'Hachon'wherethepoorlive.Livinginthe'Buildingcity'withherfamily,Yujidreamsofmovingto'Hachon'oneday.Ifshegoesthere,shemightmeetSeojin,whosuddenlydisappeared.Yuji'sparentscan'tacceptareductioninwealthandareobsessedwiththeirpresentlives.Yuji'ssiblingsarealsotroublesome.Yuji'semptydailyroutineisshatteredonedaywhenahugetornadohitsboththecityandthecountryside.