This is a complete set of "Harsh Realm," volumes 1, 2, 3, and 4, a project by Chris Carter, who also created successful overseas dramas such as "The X-Files" and "Millennium." Despite the ambition, it was a failure, and the series was canceled after only 4 volumes... Similar to works like "Ghost in the Shell," "The Matrix," and "Avalon" that delve into cyberspace, this work is also one of them. It's a subject that those who like it, really love. I have watched all of them. They played without any problems.