Pacific Ocean, Northwest.
At the seabed east of Honshu, lies a trench 890 kilometers long, 100 kilometers wide, with an average depth of over 6000 meters, reaching its deepest point at 10374 meters southeast of the Izu Islands.
It is one of the deepest trenches in the world, connecting southwards to the Ryukyu Trench and, ultimately, to the known deepest trench, the Mariana Trench.
This trench, passing through the eastern part of Honshu Island's Kashima Beach, reaches parts deeper than 8000 meters, with a depth of 8412 meters.
Above such a trench, on the tumultuous sea surface, a figure silently stepped out of a semicircular dark door, walking across the air as if it were firm ground, reaching above the ocean.
"Is this the place?"
Gazing at the rough ocean below, Reiger mused quietly.
"Who would have thought, the Prison Gate Border sealing Gojo Satoru would actually be placed by Knot in this trench, thrown into the seabed over 8000 meters deep."
