>>47239559It's optional like Bloom was.
They even added this in the description since fans complained when members weren't part of Bloom.
>[About the Participating Members in "Blue Journey"]At hololive, we and our talents are always striving to push the boundaries of what we can do.
We're always looking for ways to bring new and exciting experiences to our loyal fans, and also to introduce hololive to even more new fans.
Blue Journey is only one such endeavor among many.
And in undertaking these endeavors, we always take into account each of our talents' working styles, their current priorities, and various other factors before extending offers to them.
The human heart changes from person to person, and so too does the journey through it. This particular journey just turned out to be with these 23 members.
In Blue Journey, we will strive to make the most effective use of the participating members in each moment, and look to deliver to you the various sights and scenes we encounter along the way.
We hope that you will support hololive's newest endeavor.
And we ask that you, the fans, please understand and accept these choices made by hololive.
