[Machine Translation] In order to pay off his father's debt, Sai chooses a job that pays well, but it involves flying to another world and proving its existence. Unable to turn his back on his father, Sai flies to another world and is suddenly almost captured by the military police as a smuggler in the Chinese-style world he arrives in. However, he is intervened by the masked emperor, Ri-oh, who rules the country. He allows Sai, who possesses a "dragon mark" that brings prosperity to the country, into his palace and shelters her as his mistress. Sai, who is loved like a real queen, gradually opens his heart to Ri-oh, but when he finds out that Ri-oh has a secret...?