Demon Slayer: Kimetsu no Yaiba Enichi and Tanjiro are both teachers and friends.
Because Demon Slayer: Kimetsu no Yaiba and Tanjiro's ancestor Kamado Tankichi were good friends and stayed with Kamado Tankichi for a long time, so Kamado Tankichi took the step to step by step. Ichi's Breath of the Sun was passed down, and Tanjiro Kamado learned the Breath of the Sun through Kagura, the God of Fire, and became a user of the Breath of Fire, so Tanjiro is Enichi's apprentice.
"Demon Slayer: Kimetsu no Yaiba" Enichi:
Tsikuni Enichi was born with stripes. Later he also created the breathing method. This ability was acquired from his mother's womb. He was brought out to be stronger than many people since he was a child. This can be said to be his absolute advantage that others cannot envy. Even though he left for his brother, he is still respected by many people for his strength.
Although Yuanyi is very powerful, the mistakes he made cannot even be forgiven by himself. The first thing is that he failed to protect his wife and children. He failed to be by his side when they were in the most dangerous time. After losing his wife and children, Yuanyi also lost his greatest support.