Why Does My Martial Arts World Have an Anime Style?

In high school, students learn swordsmanship and other combat techniques. Quantitative indicators of physical fitness are an important criterion for university admission. Combat ability is a key subject. These are clearly standard urban martial arts styles. But can anyone tell me what the heck is that giant roadside advertisement for a mixed-race potion? Is the swordsmanship teacher from the Demon Slayer world, or the Pirate World? A new, incredibly popular restaurant has opened next door, and rumor has it that the chef is one of the ten most talented graduates from Totsuki. I turned on the TV, and it was broadcasting news about a meeting between the mayor and the head of Konoha Village. Celebrating the tenth anniversary of diplomatic relations between our city and Konoha. Something's a bit off about the style of this martial arts world.