Donguri

 (どんぐり; Acorn), was a sub-unit within Seifuku Koujo Iinkai, originally formed of Yoshida Kozue and Koga Miyuki. Katahira Hinako later joined. They were formed in 2000 and released one CD-R single. It is unknown when they disbanded.

Former Members

 * Yoshida Kozue
 * Koga Miyuki (古賀美雪)
 * Katahira Hinako (片平妃奈子)

CD-R

 * [2001.04.xx] Osanpo