The police received a report of the men at a marina in Yurihonjo city late Thursday night, reports public broadcaster NHK.
They were immediately taken into custody and a Korean interpreter has been brought in to help with obtaining details of their story,
It is not known whether the men intend to stay in Japan or return to North Korea.
Japan regularly sees North Korean fishing boats straying into its territory, and its coastguard has occasionally had to rescue fishermen, the BBC reported.
Defections by boat to Japan are not common given the distance, though it has happened before - in 2011, nine North Koreans tried to sail to South Korea but ended up across the sea in Japan.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.
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