On Thursday, March 31st 18:45 (JST), a new Language Settings feature, with an English option available, has been added for a limited number of players. It can be accessed via the Menu > Settings (設定) > 言語設定/Language button.
The official release of the Language option is due to be on Monday, April 11th (no time given).
As the feature is still in its alpha stage, there are parts of the game that haven’t been translated yet. The already translated parts might also be subject to changes or corrections before the official release.
The new contents added after Friday, April 1st may be released untranslated as well.