In 2018, a youthful boy called 21 Emon aspires to be a space pilot and roam the cosmos. He inherits a legacy of hotel proprietors that traces back to the Tokugawa shogunate's founder. With Earth now a destination for interstellar travelers, 21 Emon must support his family's lodging enterprise or risk bankruptcy and ensure the grand hotels continue to thrive for generations while he trains for launch and navigates stars.