its mostly just butchered swing...aka it sucks all soul out of anything jazzy and turns it into wack filler (my personal beef). BUT the exceptions are amazing....like when jazz-kei is good its fucking amazing and when its mediocre it sucks rlly hard
I don't hate it, but think it's a really lazy way to pad out a release. When I first got into vk I always thought it was cool and unique, but now I realize that like every band has a swing song.