Transit visas are usually required to transit from Japan to the United States. According to USCIS, if you are staying in Japan for more than a certain period of time (usually 24 hours) and your final destination is the United States as a non-immigrant visa holder, you need to apply for and hold a valid transit visa (usually for a B-2 visa). However, the specific situation may vary depending on personal circumstances and visa type. It is recommended to consult relevant institutions or professionals before departure.