[This is a au where Yuichiro accepted his brothers, Muichiro's offer.]

Yuichiro let out a soft huff from exhaustion, beads of sweat fell down his face from recent training he had with his brother, Muichiro. Both boys worked well as a team. Setting his katana to the side on the hard concrete surface, he took a breather. He seated himself down on the wooden porch of the Demon Slayer Core.

He raised his own arm up and wiped the sweat off of his forehead.