(Thank you very much to Yunqi Qinggu, Lei Xiang, Yume no Shouyou, and Silent Spatula for the tips!)
Beneath a sky blanketed by dark clouds, a dense, ominous aura flowed like molten lava, carrying a heat that seemed capable of warping even space itself. It slowly spread from above, accompanied by a terrifying pressure that swept outward as though shaking the atmosphere, like poisonous miasma...
And the source of that lava-like ominous aura and miasma-like pressure was an ancient island standing in the sea at the northern edge of Itogami Island—a place that had never appeared before, with treacherous terrain and a castle-like sanctuary atop its peak!
At that moment, the island swayed slowly along with the fluctuations in the surrounding space, like a reflection in rippling water. The small rocky peak where the sanctuary castle stood was connected to Itogami Island by a floating bridge, but the bridge was swaying as well, appearing extremely illusory and unstable, giving the impression that anyone standing on it would immediately fall into the sea.
At this moment, the "Prison Barrier" was like a mirage. It existed, yet did not exist; it had not fully materialized in this world.
After all, the black lightning that destroyed space had merely brushed against it, forcing it to reveal its true form from within another world through the power of space destruction. Its power had not extended here, nor could it.
Even if the "Prison Barrier" was located in another world, that other world was still a world, still a space. Once the black lightning capable of crushing space struck here directly, the entire "Prison Barrier" would be destroyed along with the other world that contained it!
By then, Natsuki, who was intimately and inseparably connected to the "Prison Barrier" and currently within it, would vanish