Prior to joining Hello Pro Kenshuusei, she was a member of NICE GIRL Project! Kenshuusei.
Hirose Ayaka was born on August 4, 1999 in Kanagawa, Japan.
In summer 2012, Hirose participated in the Morning Musume 11ki Member "Suppin Utahime" Audition, but failed to pass the third round.
On November 16, NICE GIRL Project!'s trainee program was abolished. Soon after, Hirose, Hashimoto Nagisa, Horie Kizuki, Ogata Risa, Shimano Momoko, and Inoue Rei were given the opportunity to become members of Hello Pro Kenshuusei, transferring to UP-FRONT PROMOTION and joining Hello! Project. She was formally introduced during the Hello Pro Kenshuusei Happyoukai 2014 ~11gatsu・12gatsu no Nama Tamago Show!~ recital concert on November 29 alongside the former NICE GIRL Project! trainees and three other girls.
On January 2, during the Hello! Project 2015 WINTER ~DANCE MODE!~ concert, it was announced that Hirose would be debuting in a new Hello Pro Kenshuusei unit alongside Hamaura Ayano, Taguchi Natsumi, Ogawa Rena, Nomura Minami, Wada Sakurako, Fujii Rio and Inoue Rei. The group's name was later announced as Kobushi Factory.
On March 8, during Hello Pro Kenshuusei Happyoukai 2015 ~3gatsu no Nama Tamago Show!~, Hirose Ayaka was announced leader of Kobushi Factory.
On August 22, Hirose celebrated her 17th birthday at a fanclub event titled Kobushi Factory Hirose Ayaka Birthday Event 2016, featuring two performances in Tokyo.
On August 15, Hirose celebrated her 18th birthday at a fanclub event titled Kobushi Factory Hirose Ayaka Birthday Event 2017, featuring two performances in Tokyo.
On August 6, she celebrated her 19th birthay at a fanclub event titled Kobushi Factory Hirose Ayaka Birthday Event 2018, which featured two shows at TOKYO FM HALL.
On August 5, Hirose celebrated her 20th birthday at a fanclub event titled Kobushi Factory Hirose Ayaka Birthday Event 2019, featuring two performances at Shinjuku ReNY.
On January 8, it was announced that Kobushi Factory will disband on March 30, 2020 with a concert at Tokyo Dome City Hall. Their final single is set to be released on March 4, 2020. Hirose had been in discussions with the agency about her graduation since early 2019, and after discussions with the group, the other members except Inoue Rei also expressed their desire to pursue a new path. It was eventually decided that the group would disband. Afterwards, Hirose graduated from Hello! Project, and began attending university to study music and songwriting in April 2020.
On March 12, Hirose was to hold a joint fanclub event with Inoue Rei and Ogata Risa titled Kobushi Factory Hirose Ayaka・Inoue Rei & Tsubaki Factory Ogata Risa FC Event 2020 at LANDMARK HALL. However, it was cancelled in consideration of a new policy established by the government to prevent the spread of the coronavirus.
On March 30, Kobushi Factory disbanded. Afterwards, Hirose graduated from Hello! Project with the intention of leaving UP-FRONT PROMOTION. Her profile was removed from UP-FRONT PROMOTION's website on April 1, indicating she parted ways with the company.
She has a younger sister.
When Hirose joined Hello Pro Kenshuusei, she was a first year high school student. On March 12, 2018, she announced that she graduated from high school.
Hirose's given name, Ayaka, means "color" (彩; aya) combined with "sea" (海; ka). Her parents chose "Ayaka" because it was a popular name at the time, and "so she'll become a girl who can give color to even the sea!" was an afterthought.
The following list are notable friendships Hirose Ayaka has acquired:
- Fujii Rio: Hirose is good friends with former Kobushi Factory member Fujii Rio. The pair is referred to as "Rio-Pan" a combination of their nicknames "RioRio" and "Aya-pan".
- Inoue Rei: Hirose gets along the best with Inoue Rei out of all Kobushi Factory members. They are close since NICE GIRL Project! days.
- Nakanishi Kana: Hirose gets along the best with ANGERME member Nakanishi Kana outside of Kobushi Factory.
- Kishimoto Yumeno: She is good friends with Tsubaki Factory member Kishimoto Yumeno outside of Kobushi Factory.
- Ogata Risa: She has been good friends with Tsubaki Factory member Ogata Risa since their NICE GIRL Project! days.
Here is a list of nicknames that was used to refer to Hirose Ayaka:
- Ayapan (あやぱん): Official nickname, given her since NICE GIRL Project! Kenshuusei.
- Name: Hirose Ayaka (廣瀬彩海)
- Nickname: Ayapan (あやぱん)
- Birthday: August 4, 1999
- Birthplace: Kanagawa, Japan
- Height: 157cm
- Blood type: O
- Western Zodiac: Leo
- Eastern Zodiac: Rabbit
- Hello! Project Status:
- NICE GIRL Project! Status:
- 2011-09-19: NICE GIRL Project! Kenshuusei member
- 2014-11-16: Left
- UP-FRONT GROUP Status:
- NICE GIRL Project! Kenshuusei Color:  Light Blue
- Kobushi Factory Member Color: Turquoise
- Hello! Project Groups:
- NICE GIRL Project! Groups:
- NICE GIRL Project! Kenshuusei (2011-2014)
- Shuffle Units:
- KaReiPan (2019)
- Hobby: Reading, singing, dance
- Specialty: Dance, singing, speed-reading, memorization, cartwheels
- Favorite Sport: Athletics
- Favorite Food: Bread, pastries, omelets, avocados
- Favorite Hello! Project songs: "Onaji Jikyuu de Hataraku Tomodachi no Bijin Mama", "Watashi no Kokoro", "Crying"
- Favorite Morning Musume song: Roman ~MY DEAR BOY~
- Favorite Non-NICE GIRL Project!/Hello! Project Songs: "Mirai e", "Ikitekoso" by Kiroro.
- Looks up to: Fukuda Kanon, Sugaya Risako, Ikuta Erina, Hagiwara Mai, Morozuka Kanami, Amuro Namie
- [2016.09.15] Greeting ~Hirose Ayaka・Inoue Rei~
- [2016.12.23] Kobushi Factory Hirose Ayaka・Taguchi Natsumi・Inoue Rei Birthday Event 2016
- [2017.12.21] Kobushi Factory Hirose Ayaka・Taguchi Natsumi・Inoue Rei Birthday Event 2017
- [2018.06.26] Ramen Daisuki Hamaura-san ga Iku!
- [2018.12.27] Kobushi Factory Hirose Ayaka・Inoue Rei Birthday Event 2018
- [2019.12.26] Kobushi Factory Hirose Ayaka・Inoue Rei Birthday Event 2019
-  Week End Survivor
-  JK Ninja Girls
-  Reborn ~13nin no Tamashii wa Kami-sama no Yume wo Miru~
-  JK Ninja Girls
- [2012.06.15] Tsuntube
- [2015–2019] The Girls Live
- [2016–2020] Uta-navi! (うたなび！)
-  AI・DOL PROJECT (AI・DOL プロジェクト)
- [2014–2020] Hello! Project Station
- [2014–2016] MUSIC+
- [2015–2016] GREEN ROOM
- [2016–2020] Upcoming
- [2016–2017] Girls Night Out
- [2017–2020] tiny tiny
- [2018–2020] OMAKE CHANNEL
-  Hello Pro no Monohon!
- [2019–2020] Hello Pro no Oshigoto Challenge
-  Hello Pro Kouhaku Taiko THE☆BATTLE 2019
- [2016–2019] HELLO! DRIVE! (HELLO! DRIVE! -ハロドラ-) (Wednesdays, 2016.09–2017.09; Thursdays, 2017.10–2019.06)
- She loves dancing, baseball and books.
- She has been dancing since she was 7 years old.
- Her favorite place is under her bunk bed.
- Her favorite thing is to ride roller-coasters.
- Her favorite book genres are mystery and science fiction.
- Her favorite baseball players are Takahashi Yoshinobu from the Yomiuri Giants, and Toritani Takashi from the Hanshin Tigers.
- Her favorite Hello! Project group is ANGERME.
- Her favorite actors are Takeuchi Yuko, Yoshitaka Yuriko, Kiritani Mirei, Omasa Aya and Fukada Kyoko.
- Her favorite artists are THE Possible, Canary Club and Amuro Namie.
- She is left handed.
- Her love for baseball comes from her grandfather, whom she would always watch baseball games on TV with when she was younger.
- The Yomiuri Giants is her favorite team, but Toritani Takashi from the Hanshin Tigers is her favorite player.
- She has a habit of buying books at every opportunity, so her room has become like a library. She especially likes mystery novels, particularly from female authors such as Minato Kanae and Miyabe Miyuki.
- She has a yorkshire terrier.
- At an event, she introduced herself as being the sexiest in the group. This came to her mind after wearing jeans one time and thinking to herself, "With this, there's no way that I'm not number one." She confesses though that she ranked seventh in a previous ranking, beating out only Taguchi Natsumi (who has a little sister character).
- She loves My Neighbor Totoro, and as a 4 year old child she had many of the lines memorized.
- She talks about her experience being a trainee for the now defunct Nice Girl Project, which was produced by Tsunku. Apparently, they would have street lives in Asakusa where they would perform on top of beer cases. However, sometimes only 1 or 2 people would come so some members would cry on stage. Regardless, she is really indebted to Tsunku for a lot of things.
- According to the Top Yell July 2016 interview, Hirose's role within the group is "Factory Manager for Sexiness".
- She did classical ballet up to her 6th year of elementary school. She performed as the lead role Clara in The Nutcracker, but after the recital, she quit because she decided to start becoming an idol.
- Hirose Ayaka on the NICE GIRL Project! Wiki
- Gallery:Hirose Ayaka
- List:Hirose Ayaka Discography Featured In
- List:Hirose Ayaka Concert & Event Appearances
- List:Hirose Ayaka Pocket Morning Weekly Q&A
Leader of Kobushi Factory
Oldest member of Kobushi Factory
- ↑ 1.0 1.1 "こぶしファクトリー活動終了のお知らせ" (in Japanese). Hello! Project. 2020-01-08.
- ↑ 2.0 2.1 Hirose Ayaka. "今とみんなとこれからを作る♡広瀬彩海" (in Japanese). Kobushi Factory Official Blog. 2020-03.28.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Hirose Ayaka. "嬉しいことが！！" (in Japanese). NICE GIRL Kenshuusei Official Blog "Trainees Collection". 2012-05-24 (Archived: 2014-12-02).
- ↑ Hirose Ayaka "今のこぶしにできること♡広瀬彩海" (in Japanese). Kobushi Factory Official Blog. 2020-02-27.
- ↑ Hirose Ayaka. "優男と筋肉と陸上と。♡広瀬彩海" (in Japanese). Kobushi Factory Official Blog. 2015-04-03.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 Hirose Ayaka. "初浅草(*⌒▽⌒*)" (in Japanese). NICE GIRL Kenshuusei Official Blog "Trainees Collection". 2012-05-20 (Archived: 2014-12-02).
- ↑ Hirose Ayaka. "はじめまして" (in Japanese). NICE GIRL Kenshuusei Official Blog "Trainees Collection". 2011-09-19 (Archived: 2014-12-02).
- ↑ Hirose Ayaka. "ありがとう！♡広瀬彩海" (in Japanese). Kobushi Factory Official Blog. 2018-03-12.
- ↑ Pocket Morning. 2016-11-05. (Translation by Ro-kun)
- ↑ Hirose Ayaka. "サイリウム!!" (in Japanese). NICE GIRL Kenshuusei Official Blog "Trainees Collection". 2012-09-23 (Archived: 2014-12-01).
- ↑ What do the girls manage in Kobushi Factory? (Top Yell July 2016)
- ↑ Hirose Ayaka. "過去♡広瀬彩海" (in Japanese). Kobushi Factory Official Blog. 2019-03-22.
- Kobushi Factory Profile (archived)
- Kobushi Factory Official Blog (inactive)
- Hello Pro Kenshuusei Blogs: Hello! Project tour blog, February/March 2015
- Trainees-Collection Blog (tag: "Hirose Ayaka")