Bleach? Perm? Traditional? A man should wear an Afro. This is a bible for high school boys.

(from ebookjapan):

Bleach? Perms? Dreads? Why're ya talkin' crazy for?! If you're a guy, you gotta have an Afro!

The bible for high school boys all over Japan makes its grand entrance!

One morning, Okamoto is on his way to school when he comes across a guy in school uniform with an Afro trying to break the lock on his bicycle. After breaking the lock, Afro steals the bicycle, but stops at the top of a hill because of broken gear.

Okamoto catches up with him and defeats Afro after a fierce battle. However, Afro turns out to be Tanaka, who transferred to Okamoto's class that day!