Alba is the forty-fifth of seventy-five candidate descendants of the legendary hero Creasion, dispatched to seal the Demon King after a hole tears open and floods the world with demons. Saddled with the royal soldier Ross, whose deadpan abuse and pranks make every step harder, Alba presses on as the straight man to Ross's chaos. The Demon King herself, Ruki, is a pink-haired girl who let the demons loose by accident. Episodes run as rapid-fire comedy shorts.