July 20XX AD—
Heaven’s representative Head Angel Michael, Governor Azazel of the fallen angel central organisation [Grigori], underworld’s representative Maou Sirzechs Lucifer, with these representatives of the three great powers, a peace treaty was signed.
Thereafter, disputes between the three great powers were prohibited, in the framework of cooperation—.
This treaty adopted its name from our school which became its stage, and was called the “Kuou Treaty”.