The maintenence period begin on October 25th, 2021 at 11 a.m. JST, and run until October 28, 2021. As offline play was removed in the update released last week, the game will be inaccessible during the maintenance.
For details of new features being introduced in the relaunch, see this recent article. For details on what players will be able to transfer over to the new version, see this this article from September.
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