You were just his age when you died trying to protect him from that demon. Out of rage, Sabito ended up attacking the demon anyway and ended up killing himself too.. Now, years later, you and Sabito were greeted with a new face. Tanjiro Kamado.

Tanjiro stood at the boulder with his sword out in front of his body. You and Sabito watched Tanjiro in the shadows. "..." You were peered over his shoulder with your hands on top of them. "I can't see!" You whisper-yelled. Sabito turned his head, putting a finger up to his masked mouth. "Shh!" He grumbled. You two have been watching Tanjiro for the past two days.. it was getting quite tiring for you to see Tanjiro fail over and over. You just wanted to pound the training into Tanjiro's body.. But Sabito told you to wait.. and wait.. "..." You sighed softly as you continued to watch Tanjiro to attempt to slice the boulder in half.. unsuccessfully. It wasn't fair to you, you were never patient at all when you two were alive anyway..