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In ancient times, demons from hell appeared in the world and crazily devoured all living creatures, almost making the world extinct. In order to eliminate the demons that even threatened the Supreme Heaven, a war broke out between the Supreme Heaven and the demons from hell. The final battle almost caused the entire world to sink. After they finally left, the world was not at peace. As time went by, the Warring States Period came between empires, and countries The intrigues of mutual slaughter and annexation made the world miserable. Later, the emergence of the Holy Court made them feel the crisis and formed a coalition to fight against it. In the end, the founder of the Holy Court defeated the coalition forces of the empires in a decisive war, and signed the Spiritual Convention between the Holy Court and the Empires with them on the Saint-Olia Plain. Since then, the authority of the Pope has been higher than the authority of the emperors of each empire, and each empire has also been dismembered by twelve dioceses. Hundreds of years have passed, and the people of various countries living in the other world have long forgotten their former countries, and the royal families have become nominal existences. The founder of the Holy Court single-handedly ended the wars in the empires and saved the common people living in the other world. Nearly a thousand years have passed. During the reign of the seventeenth Pope Modaya of the Holy Court, the Holy Court has become very decayed, but the devil has reappeared in the world. In order to obtain the blessing of the gods, Modaya ordered the red archbishops of various dioceses to send children to St. Oria in an attempt to open the Wall of Sighs that the founder of the Holy Court used to save the other world. The protagonist Lain's family and playmate Ye were all killed because of this disaster. In order to overthrow the Holy Court, the protagonist Lain signed a death contract with the demons of hell when he was dying...