On 28. April 2017 FEST VAINQUEUR announced that drummer KAZI left the band.
A few days beforehand, there was news that KAZI would take a break from band activities because of health problems. However following that message, the heartbreaking announcement regarding KAZI leaving the band was decided, stating differences in the musical direction. The band will continue on with 4 members.
KAZI apologized in his blog to fans and wrote that even though he sees the members as his family, he made his decision. He also confirmed tha the will continue in the music scene.
As for FEST VAINQUEUR they also announced the support drummers for their future activities.
2017.4.29 Cure World Visual Festival 2017
飴 [Ame]（Rides In ReVellion）
2017.5.3. ZEAL LINK TOUR 2017 Osaka BIGCAT
2017.5.5 ZEAL LINK TOUR 2017 Okayama CRAZYMAMA
2017.5.6 FEST VAINQUEUR 2017 TOUR
ライ （ギガマウス）[Rai (Gigamausu)]