In June, Sekine joined Hello! Project as a member of Hello Pro Egg when she passed the auditions alongside twenty-nine other girls.
In Mano Erina's single Haru no Arashi, Sekine was the backup dancer along with 3 other Hello Pro Eggs.
In April, it was announced Sekine would be a regular on the TV show Test no Hanamichi.
On May 5, Sekine and Arai Manami starred in the stage play Shiritsu Guriguri Gakuen (私立グリグリ学園).
Sekine had a small role in a 2 part horror movie titled Ada ~ADA~. The movie was directed by Koji Shiraishi and was released on July 13.
On July 4, it was announced that Sekine would be a part of a group titled @JAM ALLSTARS. The group will sing the theme song for @JAM EXPO 2014, a CD will be released for the song.
- Name: Sekine Azusa (関根梓)
- Nickname: Sekkii (せっきー)
- Birthdate: June 14, 1996
- Birthplace: Nagano Prefecture, Japan
- Bloodtype: AB
- Height: 153.5cm
- Shoe Size: 23cm
- Western Zodiac: Gemini
- Eastern Zodiac: Rat
- UP-FRONT GROUP Status:
- Up Up Girls (Kari) Color: Orange
- Favorite Food: Tuna, Apples
- Least Favorite Foods: Bitter food
- Specialty: Dancing
- Dislikes: Running.
- Looks up to: Niigaki Risa
Discography Featured In
- Up Up Girls (Kari)
- First Album (Kari) (Indie Album)
- Natsu Festival Sansen Kinen! 8/3「ROCK IN JAPAN FESTIVAL 2013」Setlist Album (Digital Album)
- Natsu Festival Sansen Kinen! 8/10「IDOL NATION 2013」Setlist Album (Digital Album)
- Natsu Festival Sansen Kinen! 9/22「Inazuma Rock Festival 2013」Setlist Album (Digital Album)
- Second Album (Kari) Special Remix Pack (Digital Album)
- Second Album (Kari) (Indie Album)
- Third Album (Kari) (Indie Album)
- 4th Album (Kari) (Indie Album)
- 5th Album (Kari) (Indie Album)
- Up Up Girls (Kari)
- Going my ↑
- Barebare I LOVE YOU
- Uppercut! / Yuudachi! Through the Rainbow
- Mechakyun♡Summer ( ´ ▽ ` )ﾉ
- Namen na! Ashi Girls / Marble Hero
- End Of The Season
- Kakko Tsukete Ii Desho! (Event Single)
- UPPER ROCK / Ichiban Girls!
- Chopper☆Chopper / Survival Girls
- Respect Tokyo / Sutorera! ~Straight Up!~
- SAKURA DRIVE / Dateline
- Next Stage / Ano Saka no Ue Made,
- Ginga Joujou Monogatari / Burn the fire!! / Natural Born Idol
- Summer Beam! / Up Up Typhoon
- SAMURAI GIRLS / Widol Seven
- Starry Night / Seishun Buildup
- Nijiiro Mosaic / ENJOY!! ENJO(Y)!!
- Santa Claus (Event Single)
- Up Ome!! ~Apuga no Oshougatsu da yo Zenin Shuugou!~ (Digital Single)
- (Kari) wa Kaesuze ☆ be your soul / Party! Party! / Jumper!
- Zenryoku! Pump Up!! / Kono Melody wo Kimi to
- Beautiful Dreamer / Zenryoku! Pump Up!! -ULTRA Mix- / Itadaki wo Mezase!
- Party People Alien / Seven☆Peace
- !!!!!!!! / Kimi to Iu Kasetsu
- UPPER DISCO / FOREVER YOUNG
- Joujou do Konjou / Be a Girl
- Ai Ai Fire!! / Watashitachi (with friend)
- Agenomics!! / Kimi Loss / Upper Ranbu
- Da Dan Dance! / Heat Beat Island / 5 to the 5th Power
- Ganbarou Nippon Ai wa Katsu Singers
- T-Palette mini All Stars
- Team Makenki
- [2013.07.13] Ada ~ADA~ (讐 ～ADA～)
- [2011-2015] Up-Front Girls
- [2012-2016] Test no Hanamichi (テストの花道) (Regular)
- [2014-2019] The Girls Live
-  Mano Erina - Hajimete no Keiken (はじめての経験) (as back dancer)
-  Mano Erina - Haru no Arashi (春の嵐) (as back dancer)
-  Mano Erina - Seishun no Serenade (青春のセレナーデ) (as back dancer)
- [2012.05.05] Shiritsu Guriguri Gakuen (私立グリグリ学園)
- [2012.06.10] Haikei shiryoshu 1 gakko kyoshitsu (Manga x anime kore 1 satsu!) (背景資料集1 学校・教室 (マンガ×アニメ これ1冊!)) (Sato Ayano, Saho Akari, Sekine Azusa, Arai Manami)
- She and Okada Yui were the first Hello! Project members to be left handed.
- She eats rice for breakfast.
- Her favorite spot is her chair at school.
- She has a habit of resting her chin in her hands.
- She is the second youngest member in Up Up Girls (Kari).
- She cried when Saho Akari was announced that she'd be a member in Up Up Girls (Kari)
- Her official Up Up Girls (Kari) color is orange.
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