500 years ago a demon named Saddler have stood against Satan and saved earth from his evil! The humans without knowing his true nature have followed him and made him a king! and thus for 500 years he and his descendants have ruled the kingdom and brought piece and power to it!

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in the current days after leaving home for 6years the first peincess Emilia have returned but she was not alone , as the demon rules state " a demon shall not bare the child of human" believing that it will bring disaster to the family what will happen to the twins what kind of trouble will they face .