Within the Underworld, countless souls arrive daily, some of which come willingly after death to accept judgment and enter the cycle of reincarnation.
Of course, where there is positive, there is negative; some souls, uneasy in life, remained troublemakers in death, unwilling to enter the Underworld for judgment and instead, causing havoc amongst the living.
This is when the role of the Soul Restrainers becomes apparent.
The existence of Soul Restrainers is to capture such malignant spirits.
Like Black and White Impermanence, Bull Head and Horse Face, charged with forcibly bringing back some lingering evil spirits from the human world to stand trial in the Underworld.
Those who deserve the Eighteen Layers of Hell receive their punishment; those who are to be reincarnated are reborn.
But evil spirits are often not easy to handle.
To capture these evil spirits, one must be more ferocious than they are.
