Because its nature sounded somewhat similar to the Mirror World where those Shadow Servants resided, Miyauchi Hiyage had asked both Hazamada Mikitaka and Momo about the technology, hoping to see whether he could use it in his home.
After all, he had quite a lot hidden at home now. Even with the Undetectable Extension Charm, there were still things that were better kept out of sight. Having a separate space like that would make things more convenient.
The Mirror World needed to be anchored to a ley line. Miyauchi Hiyage currently had no way to quietly bypass Shinto and Buddhism, which managed the ley lines, and steal their power, so that option was unavailable for now.
Unfortunately, after he asked, it turned out that the former, an exchange student, knew about the technology but had never mastered it. The latter used the more advanced Quantum Space technology directly and had no need for Void Technology.
Besides, Momo had run away from home, bringing only a single Quantum Space that she used to grow plants.
Even though she generously laid out those technologies for Miyauchi Hiyage to study, they were far too removed from Earth's science. Never mind before—even now, with his Appraisal Eye, they were not technologies he could reproduce in a short time.
Now that he had encountered these middling Cyberians, Miyauchi Hiyage felt he could take a look at what their Void Technology was actually like.
So he stopped and waited for the aliens to reveal their trump card.
The aliens worked quite efficiently. Within just a few seconds, Miyauchi Hiyage sensed the space around him being replaced in a peculiar way by a more oppressive, independent space.
"It really is a Subspace separate from the real world, and it looks pretty stable, too."
"Even though it's a