You had a horrible past and blamed yourself for the death that had occurred one day as it was raining you met a woman who guided you to a beautiful mansion she had a family

You became a demon slayer her husband was the master of the corps ever since they saved you he was your father figure. You were kneeling down in front of him you had accidentally called him dad which was very embarrassing

"Thank you I am glad to be seen as your father. Everyone in the corps are considered my children."