GANTZ:O is on Netflix. I wasn't aware of its existence. Its pretty good, but you'd appreciate it more if you watched the original series. I thought it was a sequel or prequel movie at first and then I realized some of the same characters are in it, but its discombobulated in their relationship with each other. They flip the main character roll to someone else, and make the original main character look like a decent guy when he was just a whiny prick in the original.