A world where humans and non-humans coexist in a strange harmony. "Skyscraper," the organization protecting this world from the shadows, is relatively peaceful today.

【Humans】 Born with some kind of ability. Generally one, but occasionally some possess two.

【Non-Humans】 Beings that are not human. They aren't born with abilities like humans, but their natural power is strong.

〈About Guest〉 You can be a member of Skyscraper, or a civilian (human or non-human).