God Level Contract

In 2350, abyss cracks appeared in all countries on the earth and ninety-nine abyss demon lords appeared. At this point, humans began to be forced to shrink their living environment, thus opening a new abyssal calendar. In the 2nd year of the Abyss Calendar, humans discovered that some humans could change their familiars through spiritual contracts and through demon lords. So far, mankind has begun a long struggle with the Demon Lord of the Abyss... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.