Niinuma Kisora was born on October 20, 1999 in Aichi, Japan.
In 2013, Niinuma auditioned the Morning Musume 12ki Member "Mirai Shoujo" Audition for an opportunity to join Morning Musume. She made it up to the final round, but on August 24, Tsunku announced via YouTube that they were not interested in adding new members to the group at that moment, leading to Niinuma failing to join the group in the end along with the 6 other finalist.
September 22, Niinuma joined Hello Pro Kenshuusei along with the other audition finalists, becoming the 20th generation. On the same day, an introduction video of Niinuma was uploaded to the Hello Pro Kenshuusei YouTube channel.
On December 7, Niinuma was officially introduced as a Hello Pro Kenshuusei at the Hello Pro Kenshuusei Happyoukai 2013 ~12gatsu no Nama Tamago Show!~, alongside Yamaki Risa, Yokogawa Yumei, Oura Hirona, Dambara Ruru, Haga Akane, and Funaki Musubu. All seven girls did a dance performance of Juice=Juice's debut single "Watashi ga Iu Mae ni Dakishimenakya ne".
From March 15 to May 31, Niinuma participated in the Morning Musume '14's spring concert tour as a back dancer and the opening act alongside Yoshihashi Kurumi, Nomura Minami, Wada Sakurako, Inaba Manaka and Dambara Ruru.
On October 20, Niinuma celebrated her 18th birthday at a fanclub event titled Tsubaki Factory Niinuma Kisora Birthday Event 2017, featuring two shows at Square Ebara Hiratsuka Hall.
On July 25, the comedian duo Joujou Gundan released their debut single "Nakama", which features Niinuma in the B-side "Sunao ni Narenai Sakuranbo" as a member of the fictional group Yamato Nadeshiko Semicolon along with Suzuki Keita and Akiyama Mao.
On October 23, Niinuma celebrated her 19th birthday at a fanclub event titled Tsubaki Factory Niinuma Kisora Birthday Event 2018, featuring two shows at TOKYO FM HALL.
On May 16, it was announced that Niinuma had fallen down stairs on her way to work and at the hospital was diagnosed with a tailbone fracture and a buttock contusion, which would take one month for her to recover from. She was advised to avoid intense exercise and rest. As a result, Niinuma was absent from the rest of the Tsubaki Factory Live Tour 2019 Haru・Ranman shows and the Harukanaru Toki no Naka de 6 Gaiden ~Tasogare no Kamen~ musical.
On October 23, Niinuma celebrated her 20th birthday at a fanclub event titled Tsubaki Factory Niinuma Kisora Birthday Event 2019, featuring two shows at Shinjuku ReNY.
On May 14, she opened up an official Instagram account.
On October 20, she celebrated her 21st birthday at a fanclub event titled Tsubaki Factory Niinuma Kisora Birthday Event 2020, featuring two shows at LANDMARK HALL. In compliance with government policy, cheering, crowding, standing, and closeness in the venue were prohibited, and wearing masks were required to enter.
When Niinuma joined Tsubaki Factory, she was a first year high school student. She graduated from high school in March 2018.
The following list are notable friendships Niinuma Kisora has acquired:
Niinuma's given name, Kisora, consists of the kanji meaning "rare" (希; ki) and "sky" (空; sora). Her parents wanted to include "sora" in the last part of her name, and after going through 50 different characters from "a" to "m", they decided "Kisora" had the best kanji and sound.
Here is a list of nicknames that was used to refer to Niinuma Kisora:
- Kisora (きそら): Official nickname, given her since Hello Pro Kenshuusei.
- Kiso-chan (きそちゃん): Another official nickname.
- Niinu (にいぬー): Used by Taguchi Natsumi.
- Name: Niinuma Kisora (新沼希空)
- Nickname: Kisora (きそら)
- Birthdate: October 20, 1999
- Birthplace: Aichi, Japan
- Blood Type: O
- Height: 160.2 cm (5 ft 3 in)?
- Western Zodiac: Libra
- Eastern Zodiac: Rabbit
- Hello! Project Status:
- UP-FRONT PROMOTION Status:
- 2013-09-22: Member
- Tsubaki Factory Member Color: Light Blue
- Hello! Project groups:
- Shuffle Units:
- Tsubomi Factory (2016)
- Other Groups:
- Yamato Nadeshiko Semicolon (2018)
- UP-FRONT GROUP Telework Gasshou (2020)
- [2018.03.24] Tsubaki Factory Ogata Risa・Niinuma Kisora Birthday Event 2017
- [2019.03.26] Tsubaki Factory Ogata Risa・Niinuma Kisora Birthday Event 2018
- [2020.01.26] Tsubaki Factory Niinuma Kisora・Ono Mizuho Birthday Event 2019
- [2021.03.26] Tsubaki Factory Niinuma Kisora・Tanimoto Ami Birthday Event 2020
- [2019.02.22] Tsubaki Factory 1st Official Book
- [2015–2019] The Girls Live
- [2019–2020] AI・DOL PROJECT (AI・DOL プロジェクト)
-  Hello! Project presents... "Solo Fes!"
- [2020–2021] Hello Pro! TOKYO Sanpo (ハロプロ!TOKYO散歩)
-  Ikuze! Tsubaki Factory (行くぜ！つばきファクトリー)
-  Hello! Project presents... "Solo Fes! 2"
- [2013–] Hello! Project Station
- [2014–2016] MUSIC+
- [2015–2016] GREEN ROOM
- [2016–] Upcoming
- [2016–2017] Girls Night Out
- [2017–] tiny tiny
- [2018–] OMAKE CHANNEL
-  Hello Pro no Monohon!
- [2019–2020] Hello Pro no Oshigoto Challenge
-  Hello Pro Kouhaku Taiko THE☆BATTLE 2019
-  Hello Pro Dance Gakuen Kaigai Katsudo (2 episodes)
-  Hello! Project presents... "premier seat"
- Gallery:Niinuma Kisora
- List:Niinuma Kisora Discography Featured In
- List:Niinuma Kisora Concert & Event Appearances
- List:Niinuma Kisora Publications Featured In
- List:Niinuma Kisora Pocket Morning Weekly Q&A
- Tsunku. "モーニング娘。12期メンバー「未来少女」オーディション、プロデューサーつんく♂より結果のご報告" (in Japanese). Morning Musume '14 Channel via YouTube. 2013-08-24.
- "上々軍団CDデビュー！デビューシングル『仲間』配信スタート！" (in Japanese). Hello! Project. 2018-07-25.
- "つばきファクトリー 新沼希空に関するお知らせ" (in Japanese). Hello! Project. 2019-05-15.
- "ハロー！プロジェクトメンバーオフィシャルInstagramスタート！" (in Japanese). Hello! Project. 2020-05-14.
- "★ファンクラブ会員限定イベント★「つばきファクトリー 新沼希空バースデーイベント2020」開催決定！" (in Japanese). UP-FC. 2020-09-14.
- Pocket Morning. 2016-11-06. (Translation by Ro-kun)
- "つばきファクトリー新沼希空が“20問20答”でハロプロ愛を語る！【ハロプロ誕生20周年記念連載】" (in Japanese). The Television. 2018-03-12.
- "Hello Pro Kenshuusei Perfect Directory" (ハロぷろ研修生パーフェクト名鑑). BOMB Magazine, 2013-12 Issue (pg 55). Gakken Marketing. Release Date: 2013-11-09.
- TOP YELL, 2013-11 Issue. Release Date: 2013-10-07.
- Gekkan Entame. March 2014 Issue. Published 2014-01-30.
- Tsubaki Factory Profile
- Tsubaki Factory Official Blog
- Hello Pro Kenshuusei Blogs: December 2013, February 2014, September 2014 (not tagged), November/December 2014, February/March 2015, Hello! Project Tours
- Wikipedia: Japanese
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