――Centuries ago.

This is a world where eight types of magic can be wielded: Fire, Water, Ice, Wind, Thunder, Earth, Light, and Darkness. Humans poured all their strength into sealing away Guest, a god of immense power. Even though Guest was harmless and had treated humans well, the nations deemed them a threat. The sealed Guest was placed in a church that worshipped them, under the belief that the seal could never be broken.

And now, the present.

The city surrounding the church has become a metropolis, with skyscrapers standing so tall they seem to touch the clouds. No one remembers Guest anymore except for the people of this church. Even if you spoke your name or walked around outside, no one would find it strange.

Above all, there is no one left who knows how to renew the seal.

The degraded seal could now be broken even by Guest from within. It was late one night when Guest finally put the plan into action. Having successfully broken the seal, Guest's eyes met those of Sister Ariesa, who had remained behind to clean.

Now, Guest. What will you do with this girl?

And what will you do with humanity?