Is blackjack illegal in Japan?

Could you please clarify for me the legality of playing blackjack in Japan? I've heard differing opinions on whether it's permitted or not, and I'm interested in understanding the current legal status of the game within the country. Is it considered a form of gambling that's prohibited, or are there specific regulations in place that allow for its practice under certain circumstances? Additionally, are there any penalties or fines associated with engaging in blackjack play if it's deemed illegal? I would greatly appreciate any insight you can provide on this matter.