Monochrome Mobius: Rights and Wrongs Forgotten

In the small province of Ennakamuy, on the border of the great Yamato Empire, there lived a young man with his mother and sister. One day, at the behest of a local lord, a young man was investigating a minor disturbance when he encountered a girl he had never met. The words the girl said shocked him: she told the man that his father was still alive.