Heian Torikae Monogatari - Inemuri Hime to Kyousou no Miko

Saya, a princess of the Dainagon family, loves to look at the stars in the night sky more than anything else. She has a slightly mysterious ability related to the stars. When she is discovered by Nobuaki, a sukuyo master, her destiny begins to change dramatically...! A Heian fantasy of a man-dressed princess and a black-hearted prince!