"Please contact your airline(s) to confirm whether or not you will go through the Customs and Immigration area at the transferring airport. If you will, then you most likely need a transit visa. If not, then you do not need a transit visa." https://www.us.emb-japan.go.jp/itpr_en/visa-transit.html
https://www.us.emb-japan.go.jp/itpr_en/visa-transit.html