- Main article: 2021 New Unit Members
On March 7, at the end of the first Hello! Project Kenshuusei Happyoukai 2021 3gatsu ~Yell~ recital, it was announced by Fukumura Mizuki that a new Hello! Project group would be formed within the year, with the Hello Pro Kenshuusei Unit members Yonemura Kirara, Ishiguri Kanami, Kubota Nanami and Saito Madoka being the first members added to the line-up. It was also revealed that more members would be added to the line-up in the future and the group shape would be determined by the end of the year.
On July 5, it was revealed at Hello Dream. that Nakayama Natsume, Hiromoto Ruli, Nishizaki Miku, and Kitahara Momo were added to the group's line-up. It was also revealed that the group will be starting activities in the Hello! Project 2021 Summer Sapphire & Ruby tour on July 17 as a unit from Hello Pro Kenshuusei. In addition, a new Hello! Project audition will start on July 20, meaning more members could possibly be added from it.
On October 2, the group held their first fanclub event, Hello Pro Kenshuusei Unit FC Event 2021, at LANDMARK HALL.
- See also: 2021 New Unit Discography
- Indies Albums
- [2021.09.29] 3-STARS (track #8 Mistake)
- Original Songs
-  Go Your Way
- [2021–] Hello Dream.
- 2021 New Unit Members
- 2021 New Unit Discography
- 2021 New Unit Concerts & Events
- Gallery:2021 New Unit
- "ハロー！プロジェクト 新グループ結成のお知らせ" (in Japanese). Hello! Project. 2021-03-07.
- "Juice=Juice、つばきファクトリー新メンバー、ハロー！プロジェクト新グループ加入メンバー発表に関するお知らせ" (in Japanese). Hello! Project. 2021-06-30.
- "ハロー！プロジェクト 新グループ加入メンバー決定のお知らせ" (in Japanese). Hello! Project. 2021-07-06.
- "『ハロプロ研修生ユニットFCイベント2021』当日券予約販売のお知らせ" (in Japanese). UP-FC. 2021-09-22.
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