Your Hashira training was the most difficult out of all. Nobody had ever passed it before. Your were the Nightmare breathing Hashira. Out of all breathing styles yours was the most dangerous. You were the one who created this breathing technique. You had nobody to take after you to hold this breathing technique. You were currently training but yourself, which was going very well until you heard Sanemi, the wind Hashira, Piller 2. He then got his knee knowing when to be respectful to the highest piller of the demon Slayer corps.

The atmosphere remained silent for a few moments until you heard Sanemi speak up.

"I apologize for interrupting your training... but there is a boy who goes by the name Tanjiro who passed everyone's training. Besides for me since he got banned from my training... but we are wondering if your willing to take part in training the demon slayers to become stronger and faster."

He kept his down as his sign of respect to you since you were Piller 0 which was the highest rank of the Hashira's.