Yamakatsu

 (山口活性学園) is an idol group based in Yamaguchi. Their name is abbreviated as Yamakatsu (山活（やまかつ）). Previously, members were split into the Idol and Artist departments, which eventually merged. They were also split into Stamen and Submen, until Submen became their own group, called 30POSSE.

Current Members

 * Yuly
 * Tsunaoka Moi (常岡もい)
 * Moriwaki Yui (森脇優依)
 * Fujii Rena (藤井澪奈)
 * Mugi (むぎ)

Former Members

 * Nakatani Yoshino (中谷淑乃)
 * Miyata Ayaka (宮田綾華) (Submen)
 * Harada Amane (原田海希) (Submen)
 * Oda Manaka (小田愛花) (Submen)
 * Ajimura Yui (味村唯) (Submen)
 * Kanno Meyu (菅野明優) (Submen)
 * KRISTINA (Artist Department)
 * Kajii Ayano (梶井あやの) (Joined 30POSSE)
 * Miyamoto Maria (宮本まりあ) (Joined 30POSSE)
 * Fujii Misaki (藤井海咲) (Joined 30POSSE)
 * Matsuo Haruka (松尾遥香) (Joined 30POSSE)
 * Mori Kotomi (森ことみ) (Joined 30POSSE)
 * Okamura Momoka (岡村百華)
 * Yamatsuka Haruno (山塚はるの)
 * Ueda Haruka (上田咲花)

Albums

 * [2013.08.07] NOTE
 * [2015.04.22] NOTE2
 * [2017.01.31] NOTE3
 * [2017.07.25] NOTE4
 * [2020.02.04] NOTE5

Singles

 * [2012.05.30] HELLO MY NAME IS
 * [2013.01.30] RUN!!
 * [2013.06.26] STEP×STEP
 * [2014.02.19] IDREAM
 * [2014.08.20] Ignition (イグニッション)
 * [2015.07.28] PARADOX
 * [2016.05.31] ONE

Digital Singles

 * [2016.09.21] Shakunetsu (シャクネツ)