In this world, there is a legend that has existed for many years: One day, the demon king will appear in the world, and under his command, seven terrifying demons will unleash darkness and despair upon the world.

这个世界一直流传一个传说：终有一日，魔王会降临于这个世界，魔王麾下，有七尊恐怖的魔头，他们，将带给这个世界绝望的黑暗。