Bronze Head Iron Arm?
Shouldn't that be "Indestructible Adamant Body"?
Watching the tall youth in the distance, who seemed completely unharmed, Soichiro Yagyu couldn't help grumbling to himself.
Knowing that under the full-force blow he'd just delivered, even a head made of bronze or iron should have been smashed to pieces.
"How was that?" Isshin grinned, his smile full of the unreserved sharpness and swagger unique to young people. "Did I pass, Chairman?"
The scene fell into a strange silence. Everyone's gaze shifted back and forth between Isshin, standing proudly in the middle of the yard, and Soichiro Yagyu, who was barely holding himself up.
Shock, bewilderment, awe, and confusion... all sorts of emotions filled the ruined dojo.
Soichiro Yagyu remained silent for a few breaths, then finally drew a deep breath. Suppressing the roiling blood in his chest and the numbness in his arms, he slowly got to his feet.
"Hmph." He snorted. "Since I gave my word earlier, I naturally won't go back on it."
His gaze swept across the crowd before settling on Isshin. In a low voice, he said, "From this moment on, you are an Instructor recognized by the Red Armor City Swordsmanship Association. You are qualified to open a dojo in Red Armor City and teach your Ashina Style."
"Instructor Isshin."
"Haha!" Isshin laughed heartily and casually cupped his hands. "Then I thank you, Chairman!"
He then turned to the dojo masters around him, whose expressions were complicated, and laughed cheerfully. "I'd also like to thank all the Instructors for your guidance and for bearing witness just now. We'll be living in the same city from now on, so I hope you'll look after me."
The dojo masters' facial muscles twitched at his words. They managed to force stiff smiles and returned his greeting,