About two centuries ago, in the era of flying ships, humans obtained a ticket to travel into space. Gateway was once a civilized area for humans living in a wide area, connecting star systems. However, the unexplained collapse of the Gateway, known as the "September Collapse", divided humanity. A “star” where the heritage (Four Winds) entrusted to us from the past sleeps. After two centuries, there were people chasing the "star". Atalanta Watson Ruckman and...Artemis. They were humans who began a new adventure by visiting the "stars".