I’m looking for a comic book I read when I was a kid

Nine Dragon Balls

Another masterpiece by the author of Detective Conan, Aoyama Gangshang. The original comic of this film (City Storm) won the 38th Shogakukan Comic Award. Children's Comics Division Award. Super cartoon characters interpret super funny plots. The most outstanding among them are the hilarious appearances of famous swordsmen Miyamoto Gozo and Sasaki Kojiro in Japanese history, which will definitely surprise you.

In order to learn greater skills, Yaiba went down the mountain to study in school. Leaving the familiar mountains and forests, Yaiba found novelty and pranks in a strange environment. Lots of jokes. Onimaru and Aiba, who had won the Asian Swordsman Competition, were not convinced by each other and started fighting many times. Onimaru accidentally got a sword "Fujin Sword", which suddenly became more powerful. Onimaru's ambition expanded to the point of wanting to rule the entire Japan. In order to crush Onimaru's Conspiracy, with the help of friends, Yaiba went through all kinds of hardships to find the legendary "Thunder Sword", and bravely and resourcefully defeated the killers sent by Onimaru one after another, and finally fought equally with Onimaru.

After that, Aiba and Onimaru Tengu joined forces to thwart Tsukihime’s ambition to invade the earth. Onimaru Tengu also changed his ways and returned to his right ways, and everyone ended up happy.

That’s it, the protagonist is called Tetsuken