>>9379639Nijisanji JP and Hololive JP collab fairly often, but not as often as they did before Hololive blew up with NA fans. Nowadays it's mostly just through the HL JP members who have kept up friendships with their Niji counterparts. Their members also occasionally work on the same external projects, like the Project V thing, and they still appear in joint covers from time to time (ex: Fubuki was in Gundou's recent cover of Super Affection).
Their ID branches also collab, as well as Holo ID with Niji JP.
That being said, I wouldn't expect an HoloEN-NijiEN collab to happen. HoloID with NijiEN? Sure. Not HoloEN though, HoloEN is kept more insular than the other branches.
