[Machine Translation] Yuki, who was reincarnated into another world and became a Demon King, succeeded in entering the royal city where a prince threatens the peace of the dungeon. However, the city has turned into a demon city where the undead are spreading. Yuki sneaks into the royal castle one step ahead of the brave Nell and her friends. Yuki is mistaken for a castle maid and somehow ends up rescuing the king, but she finds the prince she is looking for and is ready to strike.... However, the prince was in the hall, where there was a sense of disquiet, and he was acting strangely. Suspicious, they checked the analysis and found out a shocking fact...?