- Name: Ozeki Mai (小関舞)
- Nickname: Ozekichan (おぜきちゃん)
- Birthdate: February 10, 2002
- Birthplace: Tokyo, Japan
- Blood Type: O
- Height: 154cm
- Specialties: Violin, dancing
- Hobbies: Singing, going out with friends
- Favorite Color: Pastel blue, emerald green
- Looks Up To: Yajima Maimi, Suzuki Kanon
- Hello! Project groups:
- Country Girls (2014–2019)
- [2016.04.xx] Greeting ~Ozeki Mai~ (Greeting~小関舞~)
- [2017.04.29] Ozeki Mai Mini Photobook "Greeting -Photobook-" (小関舞ミニ写真集「Greeting-Photobook-」)
- [2019.12.18] Mai BEST (舞BEST)
- [2016.09.24] Country Girls 1st OFFICIAL BOOK (カントリー・ガールズ 1st OFFICIAL BOOK)
- TV Programs
- Net Dramas
-  #Barbeque (#バーベキュー)
- Net Programs
- [2015–] Hello! Station (ハロ！ステ)
-  Hello Pro no Oshigoto Challenge! (ハロプロのお仕事チャレンジ!)
-  Hello Pro Kouhaku Taiko THE☆BATTLE 2019 (ハロプロ紅白対抗 ザ☆バトル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)
-  Kizetsu Suruhodo Aishiteru! (気絶するほど愛してる!)
-  Harukanaru Toki no Naka de 6 Gaiden ~Tasogare no Kamen~ (遙かなる時空の中で６ 外伝 ~黄昏ノ仮面~) (guest)
- Her official Country Girls image color is medium blue.
- Was formerly with the agency Tambourine Artists.
- Participated in the Morning Musume 12th generation "Golden Audition".
- Her father is Ozeki Tatsuya, coach for the Yomiuri Giants baseball team since 2011.
- Her favorite sports are baseball and basketball.
- Has taken violin lessons since she was four years old.
- Thinks she has the best figure in Country Girls.
- Her favorite Hello! Project song is "Munasawagi Scarlet" by Berryz Kobo.
- Ozeki Mai announced her graduation from Country Girls and Hello! Project on October 18, 2019. In her announcement she stated that she would continue in the entertainment industry and wanted to challenge herself by graduating to pursue her dreams. She asked that fans support the departing members positively as people chasing their own dreams. Her graduation took place on December 26, 2019 at LINE CUBE SHIBUYA.