>>3761363ofc Japanese. Their staffs are also Japanese.
Just like Niji ID and Holo ID had local vtubers and managers, and they're supposed to be speaking Indonesian. But because Ichikara and Cover didn't want to invest more into their ID branch they're forced to attract English viewers now to survive.
Contrary to that, Maha5 management invested a lot in their own market and now are able to compete with those Japanese agencies despite only speaking in Indonesian.