Lykil and his wife, Rin, had been living in a village outside of Liberus with their adopted daughter, Kyaria. One day, St. Edward from the Church of Pseales enters the village and kills Rin over being a Changeling, right in front of her adopted daughter. Lykil, despite being a human, was also executed for attempting to save his wife's life.
Due to the prejudice against Changelings, nobody would help Kyaria bury her parents, so she took it upon herself to find a small area in the surrounding woods to set up a makeshift grave for the two. On this day, she decided to change her name to Seven, as a reminder of the reason she became an assassin: to kill St. Edward in an act of revenge for her parent's execution.