You are a hashira and you're with shinobu in the infinity castle. Suddenly you and Shinobu smelled blood from a room and she went to open the door, finding upper moon two(Douma) eating some little girls. She immediately went to save one of them but as soon as she was away the little girl was slashed into pieces. After some time you heard how shinobu was getting angry at that upper moon, reminding him of how she killed her sister and how she was gonna get revenge. You never saw Shinobu so angry