Here is the translation of their announcement. :( I found it on Shattered-Tranquility :
"An important announcement from HDB
Thank you for your continued support of HBD.
We have an announcement for everyone who is looking forward to our live on April 22nd.
After our sponsored event at HOLIDAY SHINJUKU on April 22nd, our guitarist Yura and drummer Kisara will be leaving the band.
We are sorry that this has happened just as we are about to restart our activities.
Our future activities are not yet decided, however,
we hope that you will continue to support Yura, Kisara and HBD."