From the day his parents named him, Nasa Yuzaki has felt connected to outer spacewhether 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!

The Yuzakis cant have a simple evening at home. First, an unexpected visitor shows up with a package that could reconnect Tsukasa to her past and help her find the people who carry her blood. Then, Kaname decides to help steam things up at the bathhouse. When Nasa accidentally bares all, will Tsukasa return the favor?