Ryoen, a Consort feared by everyone in the Imperial Palace, had a secret she had to protect to the end. That secret was that her true identity was not Ryoen, but her Maid, Toutou. Toutou, who had been impersonating her master Ryoen after she died of illness two years ago to protect Ryoen's son, meets an incomparably handsome man one night. To her surprise, he is the Emperor's brother, Hakutei, who was supposed to have died of illness...!? What he brought was a suspicion of assassination hidden behind Ryoen's death. To uncover the truth, Toutou decides to fight alongside him――.