Strange piece of PR, but maybe more interesting than a usual demo. Until, that is, I remember that some demos (like the one for last year's Scarlet Nexus) combine similar introductions of world and story with the actual gameplay of the full release. The Prelude here is its own complete story, although some transitions feel abrupt. It also can't shed the feeling of simply being a marketing tool rather than a visual novel that someone would make for its own sake. Despite all that, I would probably play a full-length VN in this style, with these characters, and in this world.