Kenzaburo Ishibashi is Kojiro's old senpai and the kendo coach from Machido High School. He was beaten by Kojiro during a kendo meet long ago in their high school years and seems to hold a grudge against him for that, even if it does not seem apparent. Kenzaburo is also jealous of Kojiro's team, particularly because he has Tamaki Kawazoe, a freshman of Muroe High who beat two of his kendo team members in a practice duel one time. Kenzaburo is a more dedicated teacher than Kojiro, but like his kohai he trains his kendo team only for his own personal gain.
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