Is the Hokkaido visa a visa on arrival?

Hokkaido visa is not a visa on arrival.

Visa on arrival means applying for visa approval after arriving at the destination. Traveling to any region in Japan, including Hokkaido, requires you to apply for the corresponding type of Japanese tourist or business visit visa in advance at home. You can submit a personal application to a domestic travel agency and obtain the validity period and number of entries applicable to your planned itinerary according to the specified time.