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As stated here, as an Italian citizen, you don't need a visa to enter Japan. You will get a stamp on your passport and can stay in the country for tourism up to 90 days.
By using this site you can complete the entry procedure before landing, and go through the immigration control at the airport quickly.
As stated also there
Those entering Japan on or after April 29, 2023 are no longer required to present a valid vaccination certificate or pre-departure inspection certificate, and do not need to go through quarantine procedures via Visit Japan Web. Please note that you can continue to use Visit Japan Web after April 29, 2023, so please continue to use it for entry procedures as before.