■ Communicate secretly and cooperate The wealthy aliens of Natus, the most advanced planet in the universe, have become bored of their daily lives. They went on a space trip in a personal UFO in search of stimulation, and crash-landed on Earth in an unknown explosion. Those scattered live among humans and gradually lose their identity. In the meantime, a Natus, who missed his hometown, succeeds in making a secret radio in the Natus language that humans cannot understand. ...