Without region-locking, even if the game faces slow localization it will still be available in Japanese worldwide in the meantime.
☆ NintendObs Weekly – Monday, February 6, 2017 – Sunday, February 12, 2017.
Source: 4Gamer.
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…
…Wanna play? Buy a Wii U.
Well… not anymore. Anyway, click on Dragon Quest Heroes I & II for Nintendo Switch for everything you need to know about the game. 😀