In the Black Prison World, what is most lacking is light.
The most dangerous thing is also light.
An unfathomable abyss with cold winds swirling at the entrance; lava that can scorch everything, with cracks in the earth and steam emerging before it erupts; and prisoners who plunder each other's flesh, encountering each other unexpectedly in the darkness, both perilous and fortuitous.
Only light, when it blooms in the darkness, will bring the deepest death.
Of course, with the outbreak of war between wizards and demons, thunder roared in the night, a white rainbow streaked across the sky, and the Black Prison Castle became a brilliant pearl. Now, in the Black Prison, light seems no longer the most dangerous existence.
But the threat from light has not decreased because the amount of light has increased.
On the contrary, because the sources of light have increased, confusing many dangerous sources of light, this threat has become increasingly unpredictable.
