Tonan no Tsubasa

Twenty-seven years have passed since the death of the former king in Kyo-kuni. In the absence of a ruler, law and order have collapsed, and demons now wander freely. A 12-year-old girl named Shujo becomes worried about the worsening disorder in the country and decides to take action. If the adults are unwilling to act bravely, she will take on the role of king herself.