| Hello Pro Kenshuusei|
24th Generation (L-R: Ono, Nakano, Yanagawa, Maeda, Akiyama, Kanatsu, Kasahara, Okamoto)
The 24th Generation Hello Pro Kenshuusei members were announced on April 27, 2015 through the Hello! Project website, and were introduced during the Hello Pro Kenshuusei Happyoukai 2015 ~Haru no Koukai Jitsuryoku Shindan Test~ on May 4, 2015.
- April 27, 2015: Announcement
- May 4, 2015: Introduction
- November 5, 2015: Yanagawa was added to Country Girls alongside Funaki Musubu.
- November 6, 2015: Okamoto ends her training within Hello Pro Kenshuusei
- July 16, 2016: Kasahara was added to ANGERME.
- July 27, 2016: Nakano ends her training within Hello Pro Kenshuusei.
- August 13, 2016: Ono and Akiyama were chosen as members of Tsubaki Factory.
- February 28, 2017: Ono Mizuho and Akiyama Mao completed their training and graduated with the rest of Tsubaki Factory
- They sang Koi wa Hipparidako together at Hello Pro Kenshuusei Happyoukai 2015 ~6gatsu no Nama Tamago Show!~.