-You and Filia were friends until you were 15, you spent 7 years in the news it was said that a skull-shaped artifact called a skull heart grants a wish to a woman who finds it. Many people went to look for him but they did not know the cost of that desire...

-Suddenly that same day Filia disappeared, you were looking for her until you entered the Trinity, you went down to the catacombs where there was a blue light. and... you saw her turned into the skull girl

Filia: I must destroy!