Hagiwara decided to retire from the entertainment industry to study English abroad in New Zealand following the disbandment of ℃-ute on June 12, 2017.
Hagiwara Mai was born on February 7, 1996 in Saitama, Japan.
Hagiwara continued her work within Hello! Project Kids, performing alongside Morning Musume at concerts as backup dancers.
In late 2004 Hagiwara took part in her first Hello! Project shuffle unit, H.P. All Stars, taking part alongside all the members of Hello! Project at the time. The shuffle unit released one single and became inactive by January 2005.
Hagiwara was assigned as a member of Hello! Project group ℃-ute alongside seven other Hello! Project Kids members. These eight members had been passed over when it came to the forming of Berryz Koubou, which had originally been formed to teach the Hello! Project Kids about being in a group by rotating the line-up amongst the kids. Originally ℃-ute was releasing songs on an indie label, but in 2007 they made their major debut.
Hagiwara Mai released four indie singles as a part of ℃-ute in preparation for their major debut in 2007. ℃-ute also released their first album, Cutie Queen VOL.1.
On February 21, ℃-ute released their debut single, "Sakura Chirari." On the first day in the Oricon charts it ranked third, a feat not even accomplished by Hello! Project's mother group Morning Musume (who had ranked 6th on their debut single). With their debut single, they became the youngest group (with the average age of 13) to rank in the top 10. Hagiwara provided minor vocals for their debut single.
Hagiwara also joined with Morning Musume's Kusumi Koharu to form a one-shot unit named Kira☆Pika. The group was formed to perform songs for the anime Kirarin☆Revolution, as both girls voiced characters in the series. They released their debut single on August 1.
Hagiwara Mai, along with four other members of ℃-ute and Berryz Koubou left the Hello! Project futsal team Gatas Brilhantes H.P.. The members left of their own violition due to feeling that they could not perform as high level players due to their level of ability.
On December 15, Hagiwara opened her first Ustream channel called Mai Desu ga... Nani ka?. In the show, Hagiwara invites various Hello! Project members to do activity with her such as talking and cooking.
On July 25, it was announced that Hagiwara, Yajima Maimi, Nakajima Saki and Berryz Koubou's Shimizu Saki, Sudo Maasa, Kumai Yurina and Sugaya Risako would be performing in an stage play titled CAT'S♥EYE based on a manga. The stage play ran from September 22 to September 30.
On March 2, at Forest For Rest ~SATOYAMA e Ikou~ SATOYAMA movement in YOKOHAMA, Hagiwara was announced a member of the new SATOUMI movement unit, Plumeria (later renamed HI-FIN), along with fellow ℃-ute member Nakajima Saki, S/mileage's Fukuda Kanon, and Morning Musume's Ishida Ayumi and Ikuta Erina.
On July 3, it was announced Hagiwara would be releasing her second photobook called Mai2 on August 5.
On January 17, the official site of Hello! Project announced that Hagiwara had a high fever. She was immediately taken to the hospital where she was diagnosed with influenza. For this reason she was not present for the handshake event scheduled that day and she was also not present in the Hello! Project 2014 WINTER concert tour on January 18 and 19.
From February 5 to 7, Hagiwara, Yajima Maimi, and Nakajima Saki celebrated their birthdays in a joint fanclub event called Yajima Maimi・Nakajima Saki・Hagiwara Mai 2014 Birthday Event, which featured six performances in Saitama, Osaka, and Tokyo.
On February 26, Hagiwara featured in a special book called "Graduation -High school graduation- 2014" with four other idols graduating high school that Spring. It contained photos and interviews.
On February 5, 6, and 8, Hagiwara, Yajima Maimi, and Nakajima Saki celebrated their birthdays in a joint fanclub event called ℃-ute Yajima Maimi・Nakajima Saki・Hagiwara Mai Birthday Event 2015, featuring four performances in Tokyo.
On February 7, Hagiwara and Yajima Maimi celebrated their birthdays in a joint fanclub event called ℃-ute Yajima Maimi & Hagiwara Mai Birthday Event 2016, featuring three performances in Tokyo.
During the last show of ℃-ute's 11th anniversary event on June 11, Hagiwara made an apology after Shukan Bunshun reported and published photos of her walking with a man on the tabloid's web program back in April. She admitted the man was a friend and did not think fans would misunderstand, and even considered quitting in order to take responsibility for the problems it caused. However, she spoke to the other ℃-ute members who wanted to continue to work hard together, and Hagiwara stated she would slowly do her best to regain fans' trust and support. Group leader Yajima also made a blog post with similar statements.
On February 7, Hagiwara and Yajima Maimi celebrated their birthdays in a joint fanclub event called ℃-ute Yajima Maimi & Hagiwara Mai Birthday Event 2017, featuring two performances in Tokyo.
On February 7, Hagiwara showed her face for the first time since ℃-ute disbanded (between this time, other former ℃-ute members had her face covered in photos) by opening an Instagram account on her 22nd birthday. She announced she was currently studying abroad and was working hard on a career path that is not part of the entertainment world.
On May 31, Hagiwara was announced as the design producer of &IDOL, a committee of former idols led by former Idoling!!! member Ito Yuna who aim to collaborate with various industries to develop a new market with a business concept that is centered on idols (active and retired) and would help grow the economy. Their first project was a beach café named SUMMER&IDOL which was open at Yuigahama in Kamakura Prefecture from July 2 to August 31.
On July 2, she announced that she had designed an original T-shirt for the SUMMER&IDOL project under the brand name With Mii which she plans to start as an official company. She established the company on September 13 and opened an official website for it.
Hagiwara has an older sister who auditioned for Hello! Project Kids alongside Mai, but failed to pass.
She also has a pet dog named Chip-kun.
On October 3, 2016, Hagiwara's grandmother passed away. 
Hagiwara's given name, Mai, means "dance" (舞; mai). "Mai" was the name of a heroine in a manga her mother was reading, and since the character was a very beautiful girl, she was named Mai.
- Maimai (マイマイ): Official nickname, given her since joining ℃-ute. Used by members and fans.
- Hagi-chan (萩ちゃん): Second official nickname, given her since joining ℃-ute. Used by members and fans.
- Hagitty (ハギティ): Derives from mixing "Hagiwara" and "Kitty".
- Name: Hagiwara Mai (萩原舞)
- Birth Date: February 7, 1996
- Birthplace: Saitama, Japan
- Nickname: Maimai (マイマイ), Hagitty (ハギティ), Mai-chan (まいちゃん), Hagi-chan (萩ちゃん), Mai (まい)
- Blood Type: AB
- Height: 158cm
- Western Zodiac: Aquarius
- Eastern Zodiac: Rat
- Audition Song: Te wo Nigitte Arukitai
- Hello! Project Status:
- 2002-06-30: Member
- 2005-06-11: ℃-ute member
- 2017-06-12: Graduated (℃-ute disbands)
- UP-FRONT GROUP Status:
- Years in ℃-ute: 12 Years
- Official Kaomoji: (o・ⅴ・)
- ℃-ute Color:
- Purple (2006–2009)
- Yellow (2009–2017)
- Cat's♥Eye 7 Color:
- Orange (2012)
- Hello! Project Groups:
- Shuffle Units:
- Concert Units:
- Other Groups:
- Hobby: Riding a unicycle
- Special Skill: Riding a unicycle
- Strong Point: Bright, laugh easily, natural airhead
- Weak Point: I love pranks
- Habit: Easily holding hands or linking arms with someone
- Favorite Color: Pink, light blue, orange.
- Favorite Flower: Lavender
- Disliked Thing/Thing to do: Studying, cleaning up.
- Scared of: Cats, ghosts
- Favorite Movie: "Harry Potter," "Jurassic Park"
- Favorite Book: "Nezumi-kun no Chokki"
- Favorite Word: "Daisuki" (I love you/it)
- Favorite Season: Summer
- Favorite Food: Strawberries, curry rice
- Least Favorite Food: Melon, watermelon, green bell peppers.
- Favorite Song: Genki Jirushi no Oomori Song
- Charm Point: Dimples
- [2012.04.04] Yuke! Genki-kun
- [2007.09.12] Koi no Mahou wa Habibi no Bi! (恋の魔法はハビビのビ!) (Kusumi Koharu cover)
- [2012.02.02] Yuke! Genki-kun (行け！元気君)
- [2012.04.18] Kimi wa Jitensha Watashi wa Densha de Kitaku (君は自転車 私は電車で帰宅) (C-ute Cover)
- [2009.10.21] Hagiwara Mai in Hachijojima (萩原舞 in 八丈島)
- [2011.06.14] Mizuiro (水色) (e-Hello! DVD)
- [2014.09.15] again (e-Hello! DVD)
- [2011.06.xx] ℃-ute Birthday Kikaku "3nin de Birthday Event Yacchaimasu! Datte Watashitachi 2gatsu Umare Nandesu mon! Part 2"
- [2012.06.xx] ℃-ute Birthday Kikaku "3nin de Birthday Event Yacchaimasu! Datte Watashitachi 2gatsu Umare Nandesu mon! Part 3"
- [2014.06.26] Yajima Maimi, Nakajima Saki, & Hagiwara Mai 2014 Birthday Event
- [2015.04.27] Yajima Maimi・Nakajima Saki・Hagiwara Mai 2015 Birthday Event
- [2015.04.27] Yajima Maimi・Nakajima Saki・Hagiwara Mai 2015 Birthday Event ~Solo Events Hen~
- [2016.01.28] Cutie Kankousha Fanclub Tour "Suzuki Airi & Hagiwara Mai no HagiSuzu Hokkaido wa Dekkai ℃~!"
- [2016.06.25] ℃-ute Yajima Maimi・Nakajima Saki・Hagiwara Mai Birthday Event 2016
- [2016.06.25] ℃-ute Yajima Maimi & Hagiwara Mai Birthday Event 2016
- [2017.06.24] ℃-ute Yajima Maimi & Hagiwara Mai Birthday Event 2017
- [2017.10.26] ℃-ute Okai Chisato・Hagiwara Mai FC Event 2017
- [2010.09.21] Alo! Hello ℃-ute (Mai version)
- [2012.03.13] Cutest (Mai version)
- [2012.10.22] Alo-Hello! ℃-ute 2012 (Mai version)
- [2015.07.11] Hello! Project Maruwakari BOOK 2015 SUMMER
- [2016.01.02] Hello! Project Maruwakari BOOK 2016 WINTER
- [2002.12] Minimoni the Movie Okashi na Daibouken! (ミニモニ。じゃム→ビ→お菓子な大冒険！)
-  Sentou no Musume!? (銭湯の娘!?)
-  Ousama Game (王様ゲーム) (as Kanazawa Miharu)
- [2002–2007] Hello! Morning (ハロー! モーニング)
-  ℃-ute has come. ~℃-ute ga Yatte Kita~ (℃-ute has come.～キュートガヤッテキタ～) (2 episodes)
- [2007–2008] Haromoni@ (ハロモニ@)
-  Berikyuu! (ベリキュー!)
- [2008–2009] Yorosen! (よろセン!)
- [2010–2011] Bijo Gaku (美女学)
- [2011–2012] Hello Pro! TIME (ハロプロ！ＴＩＭＥ)
- [2012–2013] Hello! SATOYAMA Life (ハロー！ＳＡＴＯＹＡＭＡライフ)
- [2014–2017] The Girls Live
-  ℃-ute no Challenge TV (℃-uteのチャレンジTV)
- [2002–2003] Liliput Oukoku (リリパット王国)
-  Suugaku♥Joshi Gakuen (数学♥女子学園)
-  34 Choume no Kiseki -HERE'S LOVE- (34丁目の奇跡 -HERE'S LOVE-)
-  Neruko wa ℃-ute
-  Keitai Shosetsuka
-  Atarumo Hakke!?
-  Akuma no Tsubuyaki
-  Sengoku Jieitai
-  STRONGER (ストロンガー)
-  CAT'S♥EYE (キャッツ♥アイ)
-  Sakura no Hanataba (さくらの花束) as Kaneko Rika (金子梨花)
-  Kirarin☆Revolution (きらりん☆レボリューション) (as Mizuki Hikaru)
- [2011–2012] Mai Desu ga...Nani ka? (萩原舞ですが、、、なにか？？)
- [2013–2017] Hello! Project Station
- [2014–2016] MUSIC+
- [2015–2016] GREEN ROOM
- [2016–2017] Upcoming
- [2016–2017] Girls Night Out
-  Japan Meat Information Service Center - Oh!Niku (日本食肉消費総合センター)
-  Tokai no Hitorigurashi (都会の一人暮らし) (Radio drama)
- [2016.10] HELLO! DRIVE! (HELLO! DRIVE! -ハロドラ-) (Fridays)
- Hagiwara is the youngest member of the Hello! Project Kids and of ℃-ute.
- Hagiwara became a member of the Hello! Project Kids shortly before turning 7 years old, making her the youngest member at the time of joining in Hello! Project's history. She held this distinction for nearly seven years until Aiko of Frances & Aiko joined in 2009 shortly after her 6th birthday. Aiko was born after Hagiwara joined Hello! Project.
- Hagiwara used to hold the record for the youngest participant on NHK's Kouhaku Uta Gassen. She appeared on the 2007 edition at the age of 11, dethroning Morning Musume's Kago Ai (who previously held the record for her 2000 appearance at the age of 12). However, in the 2008 edition Nozomi Ohashi sang the theme song to Ponyo on the Cliff by the Sea at age 9, breaking Hagiwara's record. And more recently, Ashida Mana participed in 2011 edition, while she was still 7.
- She provided the voice for Mizuki Hikaru in the anime Kirarin Revolution.
- Hagiwara's number while she was in Gatas Brilhantes H.P. was 14.
- In Episode 36 of Gintama, 3 members of ℃-ute, Okai Chisato, Hagiwara Mai and Suzuki Airi, appear at 14:40 when they start to do the same movements that the dojo does ("Dream Catcher").
- She wore sunglasses in early music videos and concerts. It was said she had eye surgery when starting out in Hello! Project.
- She is the only current member of ℃-ute with Type AB blood.
- She became a lot more popular after her time in the one shot group Kira☆Pika.
- Shares her birthday with fellow ℃-ute member, Yajima Maimi.
- Has been called the "fashionista" within ℃-ute.
- She is very good friends with everyone in ℃-ute.
- Many Kenshuusei seem to love Hagiwara's perfume and many of them have purchased it. Sato Masaki has also said that she sometimes puts on Hagiwara's perfume before Hello! Con's.
- She likes to call Suzuki Airi "Suzuko" and regularly writes this nickname for her on her blog.
- One of her best friends within Hello Project is Mitsui Aika.
- Suzuki Airi, Okai Chisato, and Nakajima Saki would choose to live with her (if they could choose one member) because of her fun and bright personality. They said she is a "very funny and caring member" which led them to choose her.
- Gallery:Hagiwara Mai
- List:Hagiwara Mai Discography Featured In
- List:Hagiwara Mai Concert & Event Appearances
Youngest active member of Hello! Project
Youngest member of ℃-ute
Youngest member of Petitmoni V
- ↑ 1.0 1.1 Hagiwara Mai. "今後について 萩原舞" (in Japanese). ℃-ute Official Blog. 2018-02-07.
- ↑ 2.0 2.1 "アイドルがプロデュースする超絶カワイイビーチカフェが由比ヶ浜に誕生！！「SUMMER&IDOL」 2018年7月2日オープン" (in Japanese). PR Times. 2018-05-31.
- ↑ 3.0 3.1 "About" (in Japanese). WithMii.jp.
- ↑ 4.0 4.1 Hello! Morning. Broadcast Date: 2002-06-30.
- ↑ Tsunku. "℃-ute （キュート） に関して" (in Japanese). Tsunku Official Website. 2005-06-11.
- ↑ http://www.helloproject.com/news/1301171500_news_hagiwara.html
- ↑ "℃-ute萩原舞 手つなぎデート報道を号泣釈明「脱退も考えた」" (in Japanese). livedoor NEWS. 2016-06-11.
- ↑ "Hagiwara Mai." blog-project. Translated: 2016-06-12.
- ↑ "Celebrating ℃-ute’s 11th anniversary。" blog-project. Translated: 2016-06-12.
- ↑ "℃-uteに関するお知らせ" (in Japanese). Hello! Project. 2016-08-20.
- ↑ "[EN] Announcement concerning ℃-ute." UP-FRONT LINK. 2016-08-20.
- ↑ https://www.instagram.com/mai_hagiwara_22462/
- ↑ https://www.instagram.com/p/Bjbsuf2ACfF/
- ↑ https://www.instagram.com/p/BktjtODgFU5/
- ↑ http://ameblo.jp/c-ute-official/entry-12208718702.html
- ↑ "卒業！mai" (in Japanese). ℃-ute Official Gree Blog. 2014-04-16.
- ↑ Pocket Morning. 2016-11-03. (Translation by Ro-kun)
- With Mii Official Site
- ℃-ute Profile (archived)
- Official ℃-ute Ameba Blog (inactive)
- Official ℃-ute GREE Blog (inactive)
- Hagiwara Mai Ustream Channel (inactive)
|Solo Acts||Tsukishima Kirari starring Kusumi Koharu (Morning Musume)|
|Kira☆Pika||Kira | Pika|
|MilkyWay||Tsukishima Kirari starring Kusumi Koharu (Morning Musume) | Yukino Noel starring Kitahara Sayaka | Hanasaki Cobeni starring Kikkawa Yuu|
|SHIPS||Kazama Hiroto (Ide Takuya) | Hiwatari Seiji (Kanai Shikou)|
|Singles||Tsukishima Kirari: 1. Koi☆Kana | 2. Balalaika | 3.Happy☆彡 | 4. Chance! | 5. Papancake | 6. Hapi☆Hapi Sunday!|
Kira☆Pika: 1. Hana wo Pu-n / Futari wa NS
MilkyWay: 1. Anataboshi | 2. Tan Tan Taan!
SHIPS: 1. TOKYO FRIEND☆SHIPS | 2. Kimi ga Iru
Other: Ooki na Ai de Motenashite
|Albums||Original: 1. ☆☆☆ (Mitsuboshi) | 2. Kirarin☆Land | 3. Kirari to Fuyu|
Mini: 1. Song Selection | 2. Song Selection 2 | 3. Song Selection 3 | 4. Song Selection 4 | 5. Song Selection 5
|Other||Kirarin☆Revolution Final Stage|
|Units & Other Acts|
|Associated Acts||Morning Musume | ℃-ute | Hello Pro Egg|
|1999||Ichii Sayaka | Yasuda Kei | Goto Maki|
|2002||Ogawa Makoto | Ayaka|
|Petitmoni V||Nakajima Saki | Hagiwara Mai | Mano Erina|
|Singles||1. Chokotto LOVE | 2. Seishun Jidai 1.2.3! / Bicycle Daiseikou! | 3. BABY! Koi ni KNOCK OUT! | 4. Pittari Shitai X'mas!|
|Albums||Original: Zenbu! Petitmoni|
Best: Tanpopo / Petitmoni Mega Best
|Other||The★Petitmobics | Petitmoni Single V Clips ①|
|Units & Other Acts|
|Associated Acts||Morning Musume | Coconuts Musume | ℃-ute | Mano Erina|
|High-King||Takahashi Ai | Tanaka Reina | Shimizu Saki | Yajima Maimi | Maeda Yuuka|
|Tanpopo#||Kamei Eri | Mitsui Aika | Kumai Yurina | Okai Chisato|
|Petitmoni V||Mano Erina | Nakajima Saki | Hagiwara Mai|
|Shin Minimoni.||Linlin | Fukuda Kanon | Takeuchi Akari | Miyamoto Karin|
|Aa!||Natsuyaki Miyabi | Suzuki Airi | Saho Akari|
|ZYX-α||Niigaki Risa | Kusumi Koharu | Umeda Erika | Tsugunaga Momoko | Tokunaga Chinami | Sudo Maasa | Wada Ayaka | Ogawa Saki|
|Zoku v-u-den||Michishige Sayumi | Junjun | Sugaya Risako|
|Discography Featured In|
|Albums||As Chanpuru: Chanpuru ① ~Happy Marriage Song Cover Shuu~ | Petit Best 10|
Other: Hello! Project no Zenkyoku kara Atsumechaimashita! Vol. 4 (Petitmoni V only)
|DVDs||As Chanpuru: Hello! Project DVD Magazine Vol.21|
|Concerts Featured In|
|Hello! Project||As Chanpuru: 2009 SUMMER | 2010 WINTER | 2010 SUMMER | 2011 WINTER|
Other: 2013 Fuyu (High-King, Petitmoni V, ZYX-α, Zoku v-u-den only) | Berryz Koubou Matsuri (High-King, Aa!, ZYX only) | COUNTDOWN PARTY 2016 (Tanpopo# only)
|Units & Other Acts|
|Associated Acts||Morning Musume | Berryz Koubou | ℃-ute | Mano Erina | S/mileage | Mobekimasu | Buono! | Guardians 4 | Shugo Chara Egg! | Hello Pro Egg|