Long, long ago, before monsters existed in this world, there were only races favored by All Gods.
Until a witch of unparalleled beauty and talent was born, her name was Tifeng, the creator of countless monsters.
Numerous powerful monsters came into being at the hands of Tifeng, filling the world with monsters and posing a severe threat to the races favored by the gods.
And then came the inevitable outcome; Tifeng, the creator of countless monsters, met the punishment of the gods: thunder descended from on high, and Tifeng perished alongside it.
However, the countless monsters created by Tifeng managed to survive, becoming part of the world's ecosystem.
But the danger posed by the monsters remained as ever.
Yemengade, lurking in the deep sea, the extinct Fenrir Wolf Pack, the Hydra Hydra, and other such monsters.
And she was one of the monsters personally created by the Monster Witch, Sleipnir, the most dangerous of them all.