Miyo, a former Arasa mourner who has been reincarnated in the demon world. She is found and killed by the Demon King, but she avoids her death flag on the condition that she works at the castle. The calm life in another world will continue like this... or so, but the Demon King is driven by destructive impulses. In order to protect the peace of her world, Miyo comes up with the idea of ​​using the erotic knowledge she cultivated in her previous life to suppress her demon lord's urges. A new heroine reincarnated into another world who confronts her nakedly!