Their vocalist temporarily stopped recording/etc because of vocal injuries, but it appears he has suddenly seceded from the band. Because of this, the band will disband after their 2018-05-18 oneman (which it seems they will perform with only 3 members), and any lives after that will be cancelled.
Their planned full album will also be cancelled.
Can't spend much time verifying my translation, so let me know if you catch anything incorrect! Original tweet is below: