Japan Tourist Visa – US Citizens:
Tourist and Business visas are not required for citizens of the United States for a stay up to 90 days. However, your passport must have at least one blank visa page and be valid for six months beyond your intended stay. If your passport is expiring or you need to have additional pages added you can view the requirements here.
Fast Passports & Visas always recommends checking with your airline as requirements may change without notice.