Akiba Shoot

Hideto Akiba is just a martial arts otaku... Of course, he has no martial arts experience whatsoever! One day, Hideto, who's convinced himself he's tough, is suddenly teased by a yankii, and of course he can do nothing but be beaten to a pulp. You can't read this book without crying—it's the ultimate fighting bible dedicated to all chuunibyou readers!

(Source: Futabasha, translated)