But leaving it to sit would take at least a day. Hammering it could cut that time drastically and finish the job much faster.
Once the stone was set, it looked like an aquamarine gem embedded in the blade. Its center was translucent, and it seemed to have changed the blade's texture. The effect was remarkable.
Tetsu no Sosuke tried activating it with a Breathing Technique, but the result was far from ideal.
A feeble trickle of water ran down the blade and splattered everywhere, like a little boy who couldn't aim while peeing.
Worse, the water was boiling hot!
Tetsu no Sosuke suspected his Breathing Technique was incompatible with the gem. He wrote to Giyu Tomioka and Tanjirō Kamado, asking whether either of them had time to come and test his latest weapon.
As it turned out, both were free. They arrived at the Hammer Hut together without having planned it.
The two fellow disciples looked at each other in surprise. Tetsu no Sosuke was surprised too. "Do you both have that much free time?"
After a moment's silence, Giyu Tomioka said, "I happened to be nearby."
"I came specifically to visit," Tanjiro said with a smile. "I just didn't expect you to write to me at exactly the right time."
"Well, since you're here, that works out nicely." Tetsu no Sosuke beckoned them over, then paused. "Uh... there's someone else?"
Only then did he notice the pig-headed boy behind Tanjiro.
The boy was bare-chested, wore a boar's head over his own, and had two Nichirin Blades hanging at his waist. He said gruffly to Tetsu no Sosuke, "Hello! You nearly got beaten to death last time!"
"..."
Tetsu no Sosuke stared at him, speechless. "Come in, all of you."
He checked again to make sure Zenitsu Agatsuma hadn't