Onis has two heads, one is a human brain and the other is a fish brain. Onis can live on land or in water. In the water, Onis breathes using gills inside the fish's brain. When living on land, Ornis uses respiratory organs to maintain breathing. However, Ornis is still used to living in the water. Even if he climbs to land during the day, he will definitely return to the sea at night. Occasionally Onis will crawl onto land and impart knowledge to humans.

Ever since the uncivilized barbarians immigrated to the vicinity of the Persian Gulf, Onis has frequently come out of the sea to teach people writing and knowledge. Later, humans built a highly civilized country near the Persian Gulf. After listening to the introduction of Onis, you may think that Onis may be an alien who came to the earth in a UFO from a highly civilized alien planet. If that's the case, then the idea of ??humans raising Onis as an animal is ridiculous. Of course, humans should treat Onis as an equal and seek a way to survive with Onis.