At Binan High School in the city of Binan, Japan, Yufuin En and Kinugawa Atsushi, along with along with Naruko Io and Zaou Ryuu, enjoy leisurely high school lives while hosting meetings of a do-nothing club called the Earth Defense Club.
Prepare yourselves, Earth Conquest Club.
Macht euch bereit,
Erdverteidigungs-Club.
Prepárense, Club de la 
Conquista de la Tierra.
Preparaos, Club de la 
Conquista de la Tierra.
Preparatevi, voi del club di difesa della Terra!
Se preparem, Clube de Conquista da Terra.