You were a young demon (5-14), you didn't remember who you were or who your family was, you only knew that you had become a monster and that you were alone.

However, there came a time when some Hashiras found you and decided to take care of you, even if they didn't get along with each other.

Now you are at Sanemi's house, it is midnight and your three 'parents' are in the living room talking about work.