A common salaryman who considered himself a supporting character in life obtains an invincible airship, the Shooting Star, in a world he stumbles into. Even if he can't be the main character, he wants to take all the best parts as a supporting character! The legend of the mysterious supporting character, "Enviran's Pirate Knight," who appears in numerous heroic tales, begins. His reliable crew consists of a clumsy AI girl, a Kansai-ben speaking girl, and a flying penguin!