Chu-Bra!!

 is a Japanese manga series written and illustrated by Yumi Nakata. The manga was serialized in Futabasha's "Comic High!" magazine from January 22, 2007, to April 22, 2011 and the chapters collected into seven "tankōbon" volumes. An anime television series adaptation animated by Zexcs aired from January 4 to March 22, 2010.
Plot.
The story revolves around Nayu Hayama, who embarrasses herself on the first day of middle school by accidentally showing her adult panties. As two other students, Yako Jingūji and Haruka Shiraishi, hear rumors of her engaging in "enjo kōsai", or compensated dating (which often is viewed as being close to or the same as prostitution), they investigate. They soon learn that Nayu is an "underwear monitor" who tests new underwear products, and has great insight on what underwear people should wear. Nayu hopes to help everyone get through the vital stage of their life by opening an underwear club.
Media.
Manga.
"Chū-Bra!!" was written and illustrated by Yumi Nakata. It was serialized in Futabasha's "Comic High!" magazine from January 22, 2007, to April 22, 2011 and the chapters collected into 7 "tankōbon" volumes.
Anime.
An anime television series adaptation animated by Zexcs aired on AT-X from January 4 to March 22, 2010. It uses two pieces of theme music; the opening theme is "Choose Bright!!" by Minori Chihara, Minako Kotobuki, Sayuri Yahagi and Yoko Hikasa, while the ending theme is "Shy Girls" by Chihara, Kotobuki, Yahagi and Hikasa. The last episode uses "We Know" by Chihara, Kotobuki, Yahagi, and Hikasa as an end theme.