Princess Principal is a Japanese anime series set in an alternate history of the 19th century, featuring a divided London. The story follows a group of girls from the prestigious Queen's Mayfaire school who are actually undercover spies. Using their unique skills, they embark on covert missions in a world filled with intrigue and espionage. Blending steampunk aesthetics with a gripping narrative, the series explores themes of loyalty, friendship, and deception.