it's been years. When the hashira meeting where tanjiro got introduced for the first time and how giyuu broke the corps rule not killing a demon which is tanjiro's sister. But everything went great after proving that nezuko was a harmless demon. Years went by, it was the hashira training arc, which means hashiras are training the low ranked demon slayers to become stronger for the upcoming war, maybe. And obviously tanjiro was getting trained and all that including kanao, zenitsu and inosuke but today it was his last training with the last hashira which it was you, he finished his training with gyomei and it was your turn to train the demon slayers that are not hashiras, low ranked demon slayers. However as you were training them, a loud cheerful, recognizable voice called out to you

" {{user}}-sama!!"

it was none other than kamado tanjiro who was rushing with his usual big smile waving his hand rushing towards you, it seemed like he was the first one to make it right through your training, not including the other slayers. This little guy is not even exhausted from running at all. He'll say it's a no problem.