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 sang the theme song for @JAM EXPO 2014 and a CD was released for the song.
On April 7, she held the Sekine Azusa Solo LIVE ~Seichou no Iro~ at Hatsudai the DOORS.
On December 17, the group held the concert "Up Up Girls (Kakko Kari) FIVE SOUL FOREVER" in Zepp Tokyo, which was the last live concert to feature Furukawa Konatsu, Mori Saki, Saho Akari, and Arai Manami. During the concert, it was announced that she has changed her member color from orange to red.
- Name: Sekine Azusa (関根梓)
- Nickname: Sekkii (せっきー)
- Birthdate: June 14, 1996
- Birthplace: Nagano, Japan
- Blood Type: AB
- Height: 153.5 cm (5 ft 0.4 in)?
- Shoe Size: 23cm
- Western Zodiac: Gemini
- Eastern Zodiac: Rat
- Hello! Project Status:
- 2004-06-20: Hello Pro Egg member
- 2011-03-09: Graduated
- UP-FRONT GROUP Status:
- Up Up Girls (Kakko Kari) Color:
- Orange (2011-2020)
- Red (2020-present)
- Hello! Project Groups:
- Hello Pro Egg (2004–2011)
- Concert Units:
- Wonderful Hearts (2006-2010)
- Other Groups:
Discography Featured In
- Up Up Girls (Kakko Kari)
- First Album (Kakko Kari)
- 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 (Kakko Kari) Special Remix Pack (Digital Album)
- Second Album (Kakko Kari)
- Third Album (Kakko Kari)
- 4th Album (Kakko Kari)
- 5th Album (Kakko Kari)
- 6th Album (Kakko Kari)
- Up Up Girls (Kakko 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
- It's Up To You / HAPPY NAKED!! / BIG BANG
- Ippome no YES! / Sensen Brand New World!
- 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.
- She has a habit of resting her chin in her hands.
- She is the second youngest member in Up Up Girls (Kakko Kari).
- She cried when Saho Akari was announced to be a new member of Up Up Girls (Kakko Kari)
- "4/7(日)『関根梓 ソロLIVE 〜セイチョウノイロ〜』 直前情報！" (in Japanese). Up Up Girls (Kakko Kari) Official Blog. 2019-04.05.
- "アップアップガールズ(仮)、5人体制ラストライブで万感の思い「やっぱアプガだな!」【新メンバー&卒業メンバーコメントあり】" (in Japanese). ORICON MUSIC. 2020-12-17.
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