Kamio Yui wa Kami wo Yui

Yui Kamio Lets Loose (神緒ゆいは髪を結い, Kamio Yui wa Kami wo Yui) is a Japanese manga series written and illustrated by SHIIBASHI Hiroshi.

Plot
What is the terrifying secret behind beautiful honor student Yui Kamio's hair?! And why must she always keep it tied up? Super popular Kiito's high school life is plunged into chaos by the worst classmate imaginable!