The Black Knights have been destroying drug cartels which have been manufacturing refrain, a drug that lets a person relive their happiest memories with severe side effects; the drug is popular with the depressed Japanese, which is why the Black Knights are targeting it. Kallen's background is explored, revealing her Japanese mother is working as a maid for her Britannian father and Kallen's disdain for the abuse her mother receives. During the Black Knight's drug raid, Kallen's mother is revealed to be a refrain user and is arrested. While Kallen's mother recovers from the drugs, Kallen promises she will change the world for her.