Synopsis
Tetsuya Wakatsuki, a young photographer, is recording an alien invasion that brutally wipes out most of humanity. After a series of accidents cause him to be shoved against the enemy commander, Tetsuya is knocked out. When he regains consciousness, he finds himself aboard a spaceship, where the alien commander, Princess Kahm of Saint Evascuraze, announces that she has developed an interest in him and wants him as her husband. Though initially reluctant, Tetsuya comes to understand that marrying Kahm might be the only way to spare the remaining humans from destruction. To end the invasion, he agrees to wed the alien princess—even though it defies the wishes of her father, the emperor.