Today, the Kalafina LINE blog updated with a message by Hikaru, stating the she also left Kalafina and Spacecraft starting October 20 2018. A handwritten version of the letter was sent to the Harmon Fanclub members.
Meanwhile, Wakana has started a solo career starting with a tour called 『Wakana Live Tour 2018 ～Toki wo Koete～』in which she performed number original songs and will release a solo single next year called 時を超える夜に Toki wo Koeru Yoru ni (composition Shusui. producer Andres Dannvik)
At this point, all that remains is an official disbandment announcement.
Thanks to HimeWakana for the news!