Synopsis: but What Am I Supposed to Do If the Demon King Is a Girl!?
Five demons launched a war against humanity, destroying more than half of its lands. Among them, the Demon King, who has killed more humans than any other, and a duke's daughter enter into a political marriage, bringing the war to a temporary ceasefire. Cecilia, the duke's daughter, sets out to win over and ensnare the Demon King, hoping to prevent the extinction of humanity. However, the Demon King is hiding a major secret...? (Source: Young Champion, translated)
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