Japan’s visitor restrictions include rules for entering the country and courtesies once you’re there. Locals still expect everyone to wear masks indoors and use hand sanitizer at every store. Catching covid in Japan means a seven day hotel quarantine, though it’s not as strongly enforced as before.
Japan’s travel restrictions were lifted in October, meaning that you can enter the country if you provide proof of COVID-19 vaccination or a negative test result taken 72 hours before departure. Children under 18 don’t need anything if they’re accompanied by an adult with the proper documents.