"The law treats Demons equally, but that does not mean Black Prison will do the same."
"We all know that different Demons are born for different reasons... Some are born as Demons, some are corrupted after being attacked by Demons, some foolishly try to break through their spiritual shackles by relying on the erosion of Demons, and still others are infected by demonic energy during their prolonged battles with Demons."
"For different Demons, Black Prison treats them differently."
"Those who fell from grace in the line of duty, or the innocents harmed by Demons, are imprisoned in cells within Black Prison Castle. In these cells, they receive limited food and a peaceful environment, where they can touch a glimmer of light... perhaps, at some point in the future, they might break free from this mad state and be reborn."