Jimoto ga Japan

From Viz:
There's a new tough guy transfer student in Tokyo. His name is Tokio and he's raring to see how scrappy the locals are. But when he comes face-to-face with a Japan-obsessed red-haired kid who won't leave him alone until he tells him exactly what prefecture he's from, his life takes a turn for the crazy! This kid isn't just Japan-obsessed, he's developed a martial art based on all the different prefectures in the country!

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