Houpri Youth

 (放プリユース) is the trainee unit for Houkago Princess, and debuted on February 18th, 2015. The members begin as Apprentices and can be promoted to Candidates, before becoming Regular members of Houkago Princess.

Youth members will sometimes perform at their own live shows or as an opening act for Houkago Princess, and Candidate (or Cadet) members often act as backing dancers and chorus for some songs, and also have a chance to appear in singles in simplified uniforms. Members can also be used as replacements for Regular members who are absent from performances.

Created before Houkago Princesses major debut, the Youth program has some minor differences to the original Apprentice and Candidate program that the group initially had. Initially, all Apprentice and Candidate members were included in single releases and wore simplified variants of the group's costumes, and acted as backing dancers and chorus. As of early 2015, Youth members are not always included in single releases, and on Candidate members are used for backing dancers and chorus in some song performances.

Promoted Members

 * Nagasawa Marina (長澤茉里奈) (Re-joined February 2015, Promoted September 22, 2016)
 * Sekine Sasara (関根ささら) (Promoted September 22, 2016)
 * Kojima Mayumi (小島まゆみ) (Joined September 6, 2015, Promoted September 22, 2016)
 * Michishige Saho (道重佐保) (Demoted on September 17, 2017, Promoted on July 12, 2018)
 * Yukino Yuria (雪乃ゆりあ) (Joined August 26, 2017, Promoted on July 12, 2018)
 * Kohinata Nanase (小日向ななせ) (Joined August 26, 2017, Promoted on October 8, 2018)
 * Yamamoto Natsumi (山本夏望) (Joined August 26, 2017, Promoted on October 8, 2018)
 * Takano Hiyori (高野日和) (Joined August 26, 2017, Promoted in November 2018)
 * Sawada Momoka (澤田桃佳) (Joined August 26, 2017, Promoted on April 15, 2019)
 * Nishimiya Airi (西宮愛理) (Joined June 12, 2020, Promoted on March 18, 2021)
 * Morikawa Yuu (森川優羽) (Joined March 13, 2021, Promoted on September 29, 2021)
 * Mizuno Ami (水野青海) (Joined April 17, 2021, Promoted March 12, 2022)
 * Togawa Yuumi (戸川優海) (Joined January 2, 2022, Promoted March 12, 2022)
 * Hanasaki Karin (花咲果林) (Joined February 2, 2022, Promoted March 12, 2022)
 * Masaki Riko (真崎莉子) (Joined February 2, 2022, Promoted March 12, 2022)

Former Members

 * Kaji Nana (梶奈々) (Joined October 2011, Withdrew November 2011) (Candidate)
 * Toyoda Serina (豊田瀬理奈) (Joined October, 2011, Withdrew November, 2011) (Candidate)
 * Nana Kaji (梶奈々) (Joined October, 2011, Withdrew November, 2011) (Candidate)
 * Haruno Akane (春野茜) (Joined April 11, 2015, Withdrew July 6, 2015) (Apprentice)
 * Kamiya Airi (神谷愛理) (Joined March 7, 2015, Graduated March 20, 2016) (Apprentice)
 * Izumi Sakura (泉美 桜) (Joined June 9, 2015, Graduated March 20, 2016) (Apprentice)
 * Makihara Yuyu (牧原ゆゆ) (Joined March 1, 2016, Graduated May 1, 2016) (Apprentice)
 * Ota Nozomi (太田希望) (Joined January 1, 2017, Fired on February 25, 2017) (Apprentice)
 * Horii Nina (堀井仁菜) (Joined January 17, 2016, Withdrew on June 3, 2017) (Candidate)
 * Tanaka Asami (田中あさみ) (Joined January 1, 2017, Withdrew on June 3, 2017) (Apprentice)
 * Haruyama Muta (晴山むた) (Joined September 4, 2017, Fired on September 17, 2017) (Apprentice)
 * Yuzuki Nene (結月ねね) (Joined August 26, 2017; Withdrew on November 13, 2017) (Apprentice)
 * Kirisawa Ririsa (桐澤怜々紗) (Joined August 26, 2017, Dismissed on December 1, 2017) (Apprentice)
 * Akimoto Natsuko (秋元なつこ) (Joined January 2018, Withdrew on March 10, 2018) (Apprentice)
 * Serizawa Ayame (芹沢あやめ) (Joined August 26, 2017, Withdrew on March 22, 2018) (Candidate)
 * Michishige Rio (道重利緒) (Joined August 26, 2017, Withdrew in April of 2018) (Candidate)
 * Takamiya Yuri (高宮悠里) (Joined August 26, 2017, Withdrew on May 13, 2018) (Candidate)
 * Suzuki Ai (鈴木亜依) (Joined August 26, 2017, Withdrew on May 12, 2018) (Candidate)
 * Nakano Yui (中野唯) (Joined August 26, 2017, Withdrew on May 12, 2018) (Candidate)
 * Tobe Marina (戸部まりな) (Joined May 2018, Withdrew on September 29, 2018) (Apprentice)
 * Sunohara Yuka (春原優花) (Joined October 15, 2018, Dismissed November 24, 2018) (Apprentice)
 * Masuda Hana (増田花) (Joined August 26, 2017, Graduated on November 29, 2018) (Candidate)
 * Shirakawa Ai (白川愛) (Joined August 26, 2017, Withdrew on December 31, 2018) (Candidate)
 * Kawanishi Fuyuka (川西冬華) (Joined August 26, 2017, Graduated on January 31, 2019) (Candidate)
 * Kusunoki Rea (楠木れあ) (Joined August 26, 2017, Withdrew on February 27, 2019) (Candidate)
 * Hanamura Nami (花村なみ) (Joined August 26, 2017, Withdrew on February 27, 2019) (Candidate)
 * Kansai Erina (閑歳絵里菜) (Joined August 26, 2017, Graduated on March 30, 2018) (Returned January 26, 2019, Withdrew on May 31, 2019) (Candidate)
 * Ozawa Ruru (小沢るる) (Joined March 23, 2019, Withdrew on May 31, 2019) (Apprentice)
 * Aoki Ririka (蒼木りりか) (Joined March 23, 2019, Withdrew on June 26, 2019) (Apprentice)
 * Himekawa Arisa (姫川ありさ) (Joined September 4, 2017, Graduated on July 31, 2019) (Candidate)
 * Morishita Rina (森下里奈) (Joined December 20, 2016, Dismissed on January 16, 2017. (Returned September 4, 2017, Graduated on July 31, 2019) (Candidate)
 * Yoshinaga Yuriko (吉永由莉子) (Joined April 2020, Withdrew June 18, 2020) (Apprentice)
 * Sato Sumire (佐藤純恋) (Joined June 5, 2019, Dismissed on June 28, 2020) (Candidate)
 * Tsurumaki Seina (鶴巻星奈) (Joined Nov 27, 2020; Withdrew April 30, 2021) (Candidate)
 * Nakano Rion (仲野りおん) (Joined March 13, 2021; Withdrew November 23, 2021) (Candidate)
 * Yoshioka Maki (吉岡真希) (Joined July 21, 2021; Withdrew March 9, 2022) (Candidate)
 * Kuroki Ayaka (黒木彩架) (Joined February 2, 2022; Withdrew June 1, 2022) (Apprentice)

Singles

 * 1) [2018.03.28] HOPE, RESTART ~Kibo no Hikari Sasho basho e~ (HOPE, RESTART ～希望の光 射す場所へ～)

Albums

 * ~10th Anniversary~ Princess Assemble~ (Sukima (2021 ver.), Juliet ~Kimi wo Suki na 100 no Riyuu~ (10th Anniversary ver.))

Singles

 * Seishun Mermaid (Cover only)
 * Abrakatab Luv! (Jasmine ~Kimi no Kokoro ga Shinjiru Mama ni~ (Team Miracle feat. Houpri Youth) )
 * Shakunetsu no Mystery Eye / Zesse Cleopatra (Zesse Cleopatra)
 * Psyllium no Shoumei (Mukai kaze o Tsukinukute)