Chuu Bra!!
English name: Chu-Bra!!
Genres: Comedy, Ecchi
Type: TV, Episodes: 12
Aired: Jan 4, 2010 to Mar 22, 2010
Studio: Zexcs
Source: Manga
Rating: R+ - Mild Nudity
Synopsis:
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  underwear" via an underwear club with her schoolmates, who are worried about their bodies' development and which underwear to choose.

(Source: ANN)