2018 Happenings
- 13 graduations
- 21 left groups
- 1 retirements
- 1 ex-leaders
- 2 disbanded groups
May 2018
- 29 Inoue Hikaru leaves HelloPro Kenshuusei
June 2018
- 20 Ogata Haruna leaves Morning Musume｡
- 20 Ogata Haruna leaves Hello! Project
July 2018
- 14 Morozuka Kanami leaves Team・Makenki
- 14 Team・Makenki disbands
- 14 Morozuka Kanami leaves Hello! Project
- 14 Kikkawa You leaves Hello! Project
- 14 Hashimoto Aina leaves Hello! Project
- 14 Okada Robin Shouko leaves Hello! Project
- 14 Gotou Yuki leaves Hello! Project
- 14 Sekine Azusa leaves Team・Makenki
- 14 Saho Akari leaves Team・Makenki
- 14 Furukawa Konatsu leaves Hello! Project
- 14 Mori Saki leaves Team・Makenki
- 14 Mori Saki leaves Hello! Project
- 14 Sekine Azusa leaves Hello! Project
- 14 Gotou Yuki leaves Team・Makenki
- 14 Arai Manami leaves Hello! Project
- 14 Saho Akari leaves Hello! Project
- 14 Arai Manami leaves Team・Makenki
- 14 Okada Robin Shouko leaves Team・Makenki
- 14 Hashimoto Aina leaves Team・Makenki
- 14 Furukawa Konatsu leaves Team・Makenki
- 14 Kikkawa You leaves Team・Makenki
August 2018
- 2 Okada Robin Shouko steps down as leader of Ciao Bella Cinquetti
- 2 Morozuka Kanami leaves Ciao Bella Cinquetti
- 2 Hashimoto Aina leaves Ciao Bella Cinquetti
- 2 Gotou Yuki leaves Ciao Bella Cinquetti
- 2 Ciao Bella Cinquetti disbands
- 2 Okada Robin Shouko leaves Ciao Bella Cinquetti
- 24 Horie Kizuki leaves HelloPro Kenshuusei
- 24 Horie Kizuki leaves Hello! Project
September 2018
- 28 Yoshizawa Hitomi retires from show business
October 2018
- 19 Takase Kurumi leaves HelloPro Kenshuusei
- 19 Ichioka Reina leaves HelloPro Kenshuusei
- 19 Maeda Kokoro leaves HelloPro Kenshuusei
December 2018
- 16 Iikubo Haruna leaves Hello! Project
- 16 Iikubo Haruna leaves Morning Musume｡