Chu-Bra!! aka Chu Bura!! is a Japanese ecchi, comedy, school manga series written and illustrated by Yumi Nakata. The story centers on Nayu, a middle school girl who shocks her schoolmates on the first day of school by wearing black lace panties. She likes this kind of underwear, and she tries to spread the word on the merits of that kind of underwear via an underwear club with her schoolmates!! :D