2010

2010 was the year when Kamei Eri, Li Chun (Junjun), and Qian Lin (Linlin) graduated from Morning Musume and Hello! Project.

Members

 * January ?: Wonderful Hearts disbands to form Hello! Project Mobekimasu
 * March 21: Uchida Yuma graduates from Canary Club and NICE GIRL Project!
 * March 27:
 * Kizawa Runa, Nagasawa Wakana, and Kudo Haruka join Hello! Pro Egg
 * Shugo Chara Egg! and Guardians 4 disband
 * April 1: Oha Girl Maple is formed
 * May 3: Melon Kinenbi disbands
 * May ?: Lilpri is formed
 * July 31: Hashiguchi Erina graduates from NICE GIRL Project!
 * September ?: Katou Karen graduates from NICE GIRL Project!
 * October 28: Ex-ceed! disbands
 * November ?: Hirano Tomomi leaves Hello! Pro Egg
 * December 15:
 * Kamei Eri, Li Chun, and Qian Lin graduate from Morning Musume and Hello! Project
 * Muten Musume disbands
 * Muten Musume is formed
 * Ice Creamusume disbands
 * Tanaka Anri, Sengoku Minami, Sainen Mia, Okai Asuna, Komine Momoka, Maeda Irori, and Kizawa Runa leave Hello! Pro Egg
 * Afternoon Musume is formed
 * Otsuka Momoko leaves NICE GIRL Project!
 * Otsuka Momoko leaves NICE GIRL Project!