Depending on your country it might be that your visa got Invalidated if you arrive on 21/3 or later. Best advise might be to contact the Japanese embassy in your current country.
g Starting from 0:00AM (JST) March 21, all efficacy of single and multiple entry visas issued by March 20 at Japanese Embassies and consulates in all areas of the Schengen member states* or Ireland, Andora, Iran, England, Egypt, Cyprus, Croatia, San Marino, the Vatican, Bulgaria, Monaco or Romania will be terminated and visa exemption measures will be stopped sequentially. This will be effective until the end of April, and effective dates may be updated.
Iceland, Italy, Estonia, Austria, Holland, Greece, Switzerland, Sweden, Spain, Slovakia, Slovenia, Czech Republic, Denmark, Germany, Norway, Hungary, Finland, France, Belgium, Poland, Portugal, Marta, Latvia, Lithuania, Liechtenstein, Luxembourgh
Quote from:
https://www.ana.co.jp/en/jp/topics/notice200127/