Ozeki graduated from Country Girls and Hello! Project on December 26, 2019, following the group's suspension of activities.
Ozeki Mai was born on February 10, 2002 in Tokyo, Japan.
In 2002, Ozeki appeared in the film Jitsuroku Hitman ~Tsuma Sono Ai~.
On April 8, Ozeki announced she had left Tamborine Artists after being bullied by another agency member. Slanderous comments were being left on her blog since New Year's, and the commenter's IP address was matched with someone she was close friends with at the agency. The other girl stayed with Tamborine Artists after Ozeki decided to leave, and she never received an apology.
On February 10, Ozeki celebrated her 14th birthday at a fanclub event titled Country Girls Ozeki Mai Birthday Event 2016, which featured two shows at Mt.RAINIER HALL.
On February 13, Ozeki celebrated her 15th birthday at a fanclub event titled Country Girls Ozeki Mai Birthday Event 2017, which featured two shows at TOKYO FM HALL.
On February 6, Ozeki celebrated her 16th birthday at a fanclub event titled Country Girls Ozeki Mai Birthday Event 2018, which featured two shows at TOKYO FM HALL.
On February 12, Ozeki celebrated her 17th birthday at a fanclub event titled Country Girls Ozeki Mai Birthday Event 2019, which featured two shows at Shinjuku ReNY.
On August 26, it was announced that Ozeki would star in Barbecue, SKY PerfecTV!'s 29th Twitter morning drama series posted every day from September 2 to September 7.
On December 26, Country Girls suspended all activities after their concert at LINE CUBE SHIBUYA, and Ozeki Mai subsequently graduated from the group and Hello! Project. Afterwards, she planned on applying to university and continuing activities in the entertainment industry.
On July 13, it was announced that she would be one of several current and former Hello! Project members starring in a new horror television drama based on the book, Hobonichi no Kaidan. It will begin airing on the dTV Channel's Hikari TV Channel+ on August 23 at 19:00 JST, and repeat airings will begin airing on TV Kanagawa on August 26 at 23:00 JST.
Ozeki is the eldest daughter of former baseball player and a current hitting coach for the Yomiuri Giants, Ozeki Tatsuya. Her grandparents have a ramen shop in Sano, Tochigi Prefecture. She has a younger sister and owns four pet cats: Gaayan, Satsuki, Mei, and Ryuu.
When Ozeki joined Country Girls in November 2014, she was a first year middle school student. She graduated from middle school in March 2017, which Remioromen's "3gatsu 9ka" was chosen to be sung by her graduating class at their ceremony. She also wrote her middle school graduation essay on the topic of "How to live in the entertainment industry."
In April 2017, she started her first year of high school. In June 2017, Ozeki's class placed first in their year in the school sports festival, and in September 2017, they won the popularity vote in the cultural festival for their haunted house classroom. Then in January 2018, her class won first place in their grade for both conducting and accompaniment in the school music festival, as well as the championship grand prize.
The following list are notable friendships Ozeki Mai has acquired:
- Morito Chisaki: She gets along best with Morito Chisaki in Country Girls.
- Shimamura Uta: Ozeki was good friends with former member Shimamura Uta since the Morning Musume '14 <Golden> Audition!.
- Sasaki Rikako: She gets along well with ANGERME member Sasaki Rikako.
- Nomura Minami: She gets along well with Kobushi Factory member Nomura Minami.
Ozeki's was given the name Mai (舞) so she could soar high (舞い上がる; maiagaru) in the future, and on the day she was born snow was whirling (舞う; mau) about.
- Name: Ozeki Mai (小関舞)
- Nickname: Ozeki-chan (おぜきちゃん)
- Birth date: February 10, 2002
- Birth Place: Tokyo, Japan
- Blood type: O
- Height: 158.5cm
- Western Zodiac: Aquarius
- Eastern Zodiac: Snake
- Hello! Project Status:
- 2014-11-05: Country Girls Member
- 2019-12-26: Graduated
- UP-FRONT PROMOTION Status:
- 2014-11-05: Member
- Years in Country Girls: 5 Years
- Country Girls Color: Medium Blue
- Hello! Project Groups:
- Country Girls (2014-2019)
- Shuffle Units:
- COOOOOUNGERME。 (2019)
- Other Groups:
- Specialty: Violin
- Hobby: Singing,  Dancing, Going somewhere with friends
- Favorite Colors: Pastel blue, Emerald
- Favorite Sports: Basketball, Baseball
- Motto: "Enjoy" (楽しむ)
- Favorite Hello! Project songs: "Tokai no Hitorigurashi", "Love Together!", "Towa no Uta", "Munasawagi Scarlet"
- Looks Up to: Yajima Maimi, Ikuta Erina
- [2016.04.28] Greeting ~Ozeki Mai~ (e-Hello!)
- See also: List:Ozeki Mai Publications Featured In
-  Kizetsu Suru Hodo Aishiteru!
-  Harukanaru Toki no Naka de 6 Gaiden ~Tasogare no Kamen~ (daily guest role)
-  Jitsuroku Hitman ~Tsuma Sono Ai~ (実録ヒットマン～妻その愛～)
-  Hobonichi no Kaidan
-  Barbecue (バーベキュー) (SKY PerfecTV! Twitter)
- [2015-2019] Hello! Project Station
- [2015–2016] MUSIC+
- [2015–2016] GREEN ROOM
- [2016–] Upcoming
- [2016–2017] Girls Night Out
- [2017–2019] tiny tiny
- [2018–2019] OMAKE CHANNEL
-  Hello Pro no Oshigoto Challenge
-  Hello Pro Kouhaku Taiko THE☆BATTLE 2019
-  Country Girls no Tadaima Radio Kenshuuchuu!! (カントリー・ガールズの只今ラジオ研修中‼)
- [2015–2019] Country Girls no Tadaima Radio Housouchuu!! (カントリー・ガールズの只今ラジオ放送中!!)
- [2016–2019] HELLO! DRIVE! (HELLO! DRIVE! -ハロドラ-) (Mondays, 2016.09–2017.09; Thursdays, 2017.10–2019.06)
- Before she became an idol, she said her dream was to become an actress.
- She knows how to ride a unicycle.
- She said she was interested in Ikuta Erina because her magic spell gag on variety shows was funny.
- She shares the same given name with Country Girls supervisor Satoda Mai and former ℃-ute member Hagiwara Mai.
- She has the same birthday as Kobushi Factory member Nomura Minami.
- She has taken violin lessons since she was four years old.
- She was born on the exact same day that Ichii Sayaka's photobook Self was released.
- Gallery:Ozeki Mai
- List:Ozeki Mai Discography Featured In
- List:Ozeki Mai Concert & Event Appearances
- List:Ozeki Mai Pocket Morning Weekly Q&A
- List:Ozeki Mai Publications Featured In
- List:Ozeki Mai Other Q&As
Youngest member of Country Girls
- ↑ 1.0 1.1 Ozeki Mai. "9月25日 歓喜。 小関舞" (in Japanese). Country Girls Official Blog. 2017-09-25.
- ↑ 2.0 2.1 "『カントリー娘。』改め『カントリー・ガールズ』について" (in Japanese). Hello! Project. 2014-11-05.
- ↑ 3.0 3.1 3.2 "カントリー娘。「カントリー・ガールズ」に改名で再始動！ “ももち”も加入" (in Japanese). AliveM.net. 2014-11-05.
- ↑ 4.0 4.1 "カントリー・ガールズ 活動休止のお知らせ" (in Japanese). Hello! Project. 2019-10-18.
- ↑ "小関 舞 おぜき まい 公式ページ" (in Japanese). Tamborine Artists Official Web Site. 2012. (Archived)
- ↑ 6.0 6.1 "巨人・小関コーチの娘は人気アイドル…「カントリー・ガールズ」小関舞の夢はパパと東京ドーム競演！？" (in Japanese). Sports Hochi. 2018-01-23.
- ↑ 7.0 7.1 "お知らせ" (in Japanese). Ozeki Mai☆my☆Diary. 2014-04-08. (Archived)
- ↑ https://twitter.com/sptv_fan/status/1165775866107854848
- ↑ "小関舞(カントリー・ガールズ)ファーストビジュアルフォトブック「舞BEST」発売決定！！" (in Japanese). Hello! Project. 2019-11-05.
- ↑ "新旧ハロプロメンバー主演で「ほぼ日の怪談。」ドラマ化、8月に配信・放送" (in Japanese). natalie. 2020-07-13.
- ↑ https://twitter.com/hobonichikaidan/status/1282586338936717312?s=21
- ↑ "新旧ハロプロメンバー主演のドラマ「ほぼ日の怪談。」予告、全12話の場面写真も解禁" (in Japanese). natalie. 2020-08-19.
- ↑ "中学生アイドルの小関舞が同じ事務所の親友からの誹謗中傷で、なぜか事務所を退社することになる不可解…の巻" (in Japanese). 芸能ポンコツ博覧会★ザビ家の栄光. 2014-04-13. (Archived)
- ↑ "カントリー・ガールズに西武・小関コーチの長女「巨人戦の始球式で投げたい」" (in Japanese). Sankei Sports. 2015-03-26.
- ↑ Ozeki Mai. "3月16日 next 小関舞" (in Japanese). Country Girls Official Blog. 2017-03-16.
- ↑ Ozeki Mai. "3月9日 好きな歌 小関舞" (in Japanese). Country Girls Official Blog. 2017-03-09.
- ↑ Ozeki Mai. "4月1日 桜咲いたら高校生 小関舞" (in Japanese). Country Girls Official Blog. 2017-04-01.
- ↑ Ozeki Mai. "6月7日 梅雨かい 小関舞" (in Japanese). Country Girls Official Blog. 2017-06-07.
- ↑ Ozeki Mai. "9月25日 歓喜。 小関舞" (in Japanese). Country Girls Official Blog. 2017-09-25.
- ↑ Ozeki Mai. "2月1日 音楽祭 結果… 小関舞" (in Japanese). Country Girls Official Blog. 2018-02-01.
- ↑ Pocket Morning. 2016-11-11. (Translation by Ro-kun)
- ↑ Shimamura Uta. "おぜこ 島村嬉唄" (in Japanese). Country Girls Official Blog. 2015-02-11. (Archived)
- ↑ 23.0 23.1 23.2 23.3 23.4 23.5 Sankei Sports. 2014-11-05 Issue. (Reference Image)
- ↑ "一輪車" (in Japaese). Ozeki Tatsuya Official Blog. 2009-05-13.
- ↑ Hello! Project ga Iku! Naruchika Higaeri Satoyama Tabi 2015 DVD. 2015-07-25.
- Country Girls Profile (archived)
- Country Girls Official Blog (inactive)
- Tambourine Artists Profile (archived)
- Former Blog "Ozeki Mai☆my☆Diary" (archived)