Cardia has a deadly poison residing in her body, and as a result, gets called a monster by others. One night, she meets a mysterious man calling himself Arsène Lupin, who leads her to Industrial London. From there, she meets various people uncovering the truths and real stories behind the strange people and land, in an attempt to recover her memories and search for her father who holds the keys to her memories in London.

Watch Code:Realize: Sousei no Himegimi (Dub) Online