Long ago, when the Earth was very young and fragile, there existed a peaceful realm where Guai, humans, and gods lived together in harmony. This place was full of lush lands, sacred temples, and divine presence, and it was considered a paradise.
But one day, a human trespassed into the Realm of Hell, unknowingly offending the powerful entities that guarded it. The gods of the four hells — guardians of punishment and balance — saw this as an affront.
炎獄 (En-goku) – Hell of Flames: Lava rivers, volcanoes, and fire demons. Punishment through fire and trial by burning.
氷獄 (Hyō-goku) – Hell of Ice: Frozen wastelands, glaciers, and frost beasts. Punishment through isolation and slow despair.
暗獄 (An-goku) – Hell of Shadows: Endless darkness, phantom assassins. Punishment through fear, illusions, and regret.
腐獄 (Fu-goku) – Hell of Decay: Swamps of rot, plagues, and undead horrors. Punishment through corruption and destruction.
In retaliation, the hell gods unleashed their wrath on the human realm, bringing destruction with a terrifying yet controlled precision. The chaos was immense, and only the most powerful god of death, Yanruo Wang, intervened.
Yanruo Wang defeated the hell gods and sealed them in different regions of the Earth:
South, East, West, and North, each containing the remnants of their hellish power.
The human who caused the offense was returned to Earth, but the Guai had already infiltrated the mortal world, living among humans in secret. Over time, humans learned to coexist with these beings, who carried the energy of Shijoku — the underworld power, Meiryoku.
The realm of Shijoku is no ordinary place. Those who are born within it, or carry its essence, are immortal by birth, for it is the destiny of Shijoku to grant life beyond the limits of time.
Shijoku exists between the human world and the world of the Guai, acting as a bridge of energy, life, and spiritual power. From this realm flows Meiryoku, the source of all power, connecting humans, monsters, and gods alike.
It is in Shijoku that the fate of all beings is intertwined — humans who trespass, Guai who wander, and overlords who rise — for whoever holds the essence of Shijoku holds the key to immortality, power, and the balance of world
Diazo Dori slowly opened his eyes, blinking against the morning light. His heart raced, still caught in the remnants of what he had seen.
"What… was that?" he whispered to himself. "A dream? Or… something else?"
He shook his head, trying to make sense of the fleeting images. Faces, places, powers — and then, unexpectedly, he saw his old friend again. The vision vanished, leaving only the faint echo of Shijoku in his mind.
"Maybe… it was just a dream," Diazo muttered, taking a deep breath. But deep down, he knew it was more.
"I… am Diazo Dori," he said, his voice firm. "A Kaijin. That is who I am… and who I have always been."
He stood tall, eyes blazing with resolve. "And now… I will be the teacher of the next generation of Kaijins. They will learn, they will fight, and they will protect the balance between humans and Guai… as I once swore to do."
Diazo Dori yawned as he walked down the sunlit footpath. "Another day… and another dream," he muttered. "Could the world really be like that? Is it possible?"
Birds chirped in the trees. Cars passed by. People hustled through the streets. "Maybe today I should do something… after all, it's my first day as the teacher of the Kaijins. I need to be polite with them," he thought. "Last year, things didn't go smoothly… but now? I can do it right."
As he walked, a commotion caught his attention: a thief was holding up an old woman's bag.
"Hey! Give me your money!" the thief demanded.
"Help!" the woman cried.
Diazo sighed, adjusting his posture. "Really, people. You shouldn't abuse your power like this," he said calmly.
The thief sneered. "Who are you?"
Diazo smiled faintly. "You may have heard of me. People call me Diazo Dori, but you… you can call me Mr. Polite. Doesn't it suit me?" He stepped closer, positioning himself between the thief and the woman.
"You think you can fool me?" the thief growled.
"I'm not here to fool anyone," Diazo replied evenly. "Now… put the gun down. Help is better than violence. Or… I will call the police."
The thief's eyes narrowed. "I'll shoot!"
Diazo raised a single hand. The bullet froze in midair, hovering inches from him.
"What… what is this?" the thief stammered, eyes wide.
"You really tried to shoot us?" Diazo said, unimpressed. "Disappointing. I don't like showing my power to ordinary people — rules are strict — but when someone needs help… I step in."
The thief panicked and tried again. The bullet froze again, this time sinking harmlessly into the ground. "No… it can't be! You're a monster!"
Diazo tilted his head. "Monster? Perhaps. But I'm polite too." He raised his hand again, and the gun gently flew from the thief's grip into his own palm. "You should never threaten my friends, or the innocent. Now…"
The thief trembled. "Please… don't hurt me!"
Diazo smirked. "Run if you like. But it won't be easy." With a calm flick of his wrist, the thief collapsed into a sleep-like state.
Diazo picked up the woman's bag and handed it back. "Here you go, Granny."
He turned, only to find… she had vanished.
Diazo blinked, scratching his head. "Wait… what? She ran? I wanted to help…"
He made a funny face, shrugging at the empty street. "Well… at least the Kaijins will learn from this. Politeness… and power."