First comes marriage, then comes an earthbound love that is out of this world!

From the day his parents named him, Nasa Yuzaki has felt connected to outer space...whether he likes it or not. His efforts to outperform the space program veer off course when an accident introduces him to Tsukasa, a mysterious girl with strange powers. Is she an alien, a moon goddess, or something else? Since she insists on marrying him, Nasa will have plenty of chances to find out!

Chaperoning a class trip to Hokkaido gives Nasa and Tsukasa the chance for some private lessons of their own. Nasa passes the test of driving on mountain roads, while Tsukasa completes a survey of local foods. But they have work to do as well, escorting Nasa's students to the legendary Sea of Clouds. And every day with Tsukasa is a history lesson, as she recalls children she taught in the distant past...