Whose Contract Uses This?

In an accident, Ivan traveled to a strange world with his contract ability. There are elves, dwarves, and goblins in this world. Normally, this should be a magical world. But after getting to know more deeply, he found that the creatures here were more like a fantasy world setting, with practitioners flying into the sky and escaping from the earth, and sects in the world constantly fighting. Just when he thought he saw the truth about the world, the Apocalypse descended from the sky and began to harvest the world. Only then did he realize that this was actually a science fiction world!