Uchi no Heika ga Shinmai de.

Shuka, princess of the kingdom of Kouka, was raised in a very sheltered environment in an inner palace. As her fifteenth birthday approaches, her father and brothers die one by one because of a sudden epidemic, and the kingdom has to find a new king (or queen)...! Supported by Zen, a military officer who serves as her retainer, Shuka must face the challenge of a role she knows little about...