Don-sama is a young individual who responded to an advertisement promising anyone could lead an invasion force, assembling a ragtag squad to conquer the cosmos. His team features the aloof Pepu and the gaming-focused Chiku, though their effectiveness is questionable. Initially targeting Earth for invasion based on grandiose manuals promising easy victory, the mission failed immediately when they couldn't convince humanity to surrender.

Following this setback, Don-sama and the squad landed on Earth to devise a new subjugation plan. Their priorities abruptly shifted to securing basic survival needs like food and rent, forcing them to postpone galactic domination. Their spaceship vanished during the mission, leading them to an Earthling boy who offered assistance. This encounter resulted in the squad taking part-time jobs on Earth while persistently continuing their efforts to achieve their goal of planetary conquest. Don-sama remains the leader, guiding the group's activities through these ongoing challenges and adaptations to human society.