Make Early Full-Immersion VR Tech Compared to Our Timeline and the One Somewhat Like Ours That the Young Man Whose Consciousness Subsumes Chiharuka's Comes/Came From a Plot Point

     Full Dive tech showing up as early as it does in canon should be a plot point as part of this crossover; I'll say elements of it brought some of the technological steps along the way in early even if they weren't supposed to get into the right hands for that. I just don't exactly know quite how this would be done or play out yet.