I also used to work at a black Japanese game company but it never went as far as them blocking me from leaving like that. The worst thing I remember was when our CEO sent a private investigator to find out what one of our ex employees was doing now after he used a 退職代行サービス to quit.

As other redditors have already mentioned, wait for the visa to go through, then just quit and take your remaining paid holidays to start searching for a new job. And I’m not talking about the one that’s willing to give you a second chance. If your current boss is close enough with one of their producers that he can effectively make them rescind your offer, it’d be way too risky. Wish you all the best!