Issei Mamehara
Native name豆原 一成
Birth dateMay 30, 2002 (age 24)
Birth placeManiwa, Okayama, Japan
Other namesMáme[1]
OccupationSinger · actor
Issei Mamehara
GenreJ-pop · K-pop
InstrumentVocals
Years active2019–present
LabelLapone
Current member ofJO1
WebsiteOfficial website
Issei Mamehara
Headercolortransparent
Hideno
Kanji豆原 一成
RomajiMamehara Issei
Hiraganaまめはら いっせい
Hangul마메하라 잇세이
RrMamehara Itsei
MrMamehara Issei
Ibox-orderja, ko1

Issei Mamehara (豆原 一成, Mamehara Issei, born May 30, 2002), is a Japanese singer and actor. He debuted as a member of the Japanese boy band JO1 in 2020, after placing first in the first season of Produce 101 Japan. He made his debut as an actor in 2021 and played Kamen Rider Chimera in the Kamen Rider Revice films.

Early life and education

Issei Mamehara was born on May 30, 2002, in Maniwa, Okayama, Japan.[2][3] During his early years, he developed a passion for physical activities, participating in baseball, swimming, and sumo tournaments throughout his school life.[3] Mamehara's interest in dance emerged during elementary school, inspired by his older sister's dance classes.[4][5] This interest deepened when he became a fan of the boy band Generations from Exile Tribe after watching one of their televised performances, prompting him to enroll in a dance school in his second year of junior high.[5][6] He specialized in 1990s hip hop dance[6] and began teaching children at the same dance school by his freshman year of high school.[4][7] Mamehara also grew up with a deep appreciation for tokusatsu media, particularly the Kamen Rider franchise, and aspired to appear in the series as an actor.[4]

Mamehara graduated from high school in March 2021.[8]

Career

2019–2020: Produce 101 Japan and debut with JO1

After failing a series of auditions in 2019, Mamehara's older sister, a fan of South Korean Produce 101, suggested he try out for Produce 101 Japan. Having limited knowledge about K-pop, he initially refused to apply because he wanted to be a professional dancer instead.[4][5] He eventually applied a day before the deadline, following his sister's encouragement.[5] The show was held from September to December, where he finished first with 261,583 votes.[9][10][11]

Following an "intense" boot camp in South Korea,[7] seventeen-year-old Mamehara debuted as a member of the resulting boy group JO1 on March 4, 2020, with the release of their first single Protostar under Lapone Entertainment. His win awarded him the choreographic center position in the group's debut song, "Infinity".[4][9][12]

2020–present: Acting debut

In November 2020, Mamehara was named Mezamashi TVs monthly entertainment presenter, making him the segment's youngest presenter at that time.[13] He then took acting classes and made his acting debut in the Yoshimoto Kogyo-produced anthology film, Meters Away, Worlds Apart in 2021,[4][14] alongside Produce 101 Japans host and comedian Takashi Okamura.[8][14] In 2022, Mamehara was cast as Kamen Rider Chimera in the film Kamen Rider Revice: Battle Familia.[15][16] He reprised his role in Birth of Chimera (2022), an exclusive Toei Tokusatsu Fan Club spin-off film that delves into his character's backstory.[17]

In 2023, he made his small screen debut in NHK's War Records of Superhuman Fortress Hiroshi, as the humanoid Hiroshi.[18][19] In the following year, he made his TBS Sunday Theatre debut in the Ryunosuke Kamiki-led drama The Diamond Sleeping in the Sea.[20] In February 2025, Mamehara was appointed as an ambassador to his hometown of Maniwa.[21] Later that year, he is set to play the lead role of Tsukasa Kiriki for the live action movie adaptation of the manga Bad Boys[22] and co-star opposite Yoshie Ichige in the family drama Mt. Fuji, Coffee, and the Formula for Happiness.[23] Issei will play Ichige's grandson, Takuma, a university student who likes coffee and discovers his dream with his grandmother.[23]

Discography

For Mamehara's discography with JO1, see JO1 discography.

Singles

TitleYearPeak chart positionSalesAlbum
JPN
DL
[24]
"Not Puppy Love"202547

Songwriting credits

All song credits are adapted from the Japanese Society for Rights of Authors, Composers and Publishers's database, unless otherwise noted.[26]

Key
Indicates a non-commercial release
TitleYearArtist(s)AlbumLyricsRef.
CreditWith
"Breaking the Rules"2023Keigo, Takumi, Máme2023 JO1 2nd Arena Live Tour "Beyond the Dark – Rise in Kyocera Dome"Keigo, T.K, Máme[26]
scope="row" style="background-color:#b1d6f5 | "Not Puppy Love"2025Mámerowspan=2 [a]Sean Bowe[27]
scope="row" style="background-color:#b1d6f5 | "Mama" (none: ママへ)Makka[26][28]

Filmography

For Mamehara's works with JO1, see JO1#Filmography.

Film

YearTitleRoleNoteRef.
2021Meters Away, Worlds ApartHiroki AsadaSegment: "Today is A Good Day"[14]
2022Kamen Rider Revice: Battle FamiliaNozomu Otani / Kamen Rider Chimera[15]
2025Bad Boys: The MovieTsukasa KirikiLead role[22]
Mt. Fuji, Coffee, and the Formula for HappinessTakuma AndōLead role[23]

Television

YearTitleRoleNoteRef.
2019Produce 101 JapanContestantFinished 1st[9]
2020Mezamashi TVHost of the month[13]
2022Short ProgramHajime ToshinoLead role; anthology series[29]
Kamen Rider Revice Movie Spin-Off Web Drama: Birth of ChimeraNozomu OtaniLead role; television film[17]
2023War Records of Superhuman Fortress HiroshiHiroshi Tanaka[18]
Azatoi Type A to ZTakumaDrama segment of Azatoku Nani ga Waruino?[30]
An Encouragement of Laughing LifeNobuyuki Yamamoto[31]
2024Mame's and Sho's Best Holiday - JO1derful TourHimselfWith Sho Yonashiro[32]
The Diamond Sleeping in the SeaSeiya[20]

Music videos

YearTitleRef.
2025"Not Puppy Love"[27]
"Mama" (ママへ)[28]

Footnotes

  1. ^ PlanJ is a series of self-projects by JO1 members on YouTube.[27]

References

  1. ^ Sirikul, Laura. "JO1 on their JAM packed tour". Timid Magazine. Archived April 23, 2025 at the Wayback Machine. Retrieved 19 May 2025.
  2. ^ "オーディションから誕生の「JO1」の凄さと詳細プロフィール紹介" (in Japanese). News Post Seven. 15 April 2020. Archived March 7, 2023 at the Wayback Machine. Retrieved 10 March 2023.
  3. ^ "JO1・豆原一成さんに聞く 「世界を舞台に戦いたい」" (in Japanese). Sanyo Shimbun Digital. 7 March 2020. Archived 7 March 2020 at the Wayback Machine. Retrieved 10 March 2023.
  4. ^ "ドラマ初主演&ドキュメンタリー映画公開で勢いに乗る 「JO1」最年少メンバー・豆原一成インタビュー". Talent Power Ranking. 9 March 2022. Archived November 12, 2022 at the Wayback Machine. Retrieved 10 March 2023.
  5. ^ Murakami, Natsuna (17 October 2021). "JO1 豆原一成の"挑戦"し続ける人生 今、同世代に伝えたいこと" (in Japanese). Real Sound. Archived June 30, 2022 at the Wayback Machine. Retrieved 10 March 2023.
  6. ^ "【白濱亜嵐×豆原一成】豆ちゃんの印象は？「子犬みたいで超可愛い♥」今をときめくイケメン2人の激エモ対談". Ar Magazine. 11 December 2021. Archived February 3, 2024 at the Wayback Machine. Retrieved 3 February 2024.
  7. ^ E. Morales, Iavana (24 May 2023). "JO1 Open Up About "Tropical Night," Produce 101 Japan, and Their 3-Year Journey Since Debut". Teen Vogue. Archived May 24, 2023 at the Wayback Machine. Retrieved 3 February 2024.
  8. ^ "不器用な青年を好演！豆原一成(JO1)が映画初出演で見せたステージ上とのギャップ" (in Japanese). Hominis. 5 January 2022. Archived December 6, 2022 at the Wayback Machine. Retrieved 10 March 2023.
  9. ^ "『PRODUCE 101 JAPAN』JO1、デビューメンバー11人が決定 初代センターは最年少17歳の豆原一成" (in Japanese). Oricon. 11 December 2019. Archived December 11, 2022 at the Wayback Machine. Retrieved 10 March 2023.
  10. ^ "「PRODUCE 101 JAPAN」デビューメンバー11人決定 1位は最年少・豆原一成＜1位～20位最終順位＞" (in Japanese). Modelpress. 11 December 2019. Archived December 11, 2019 at the Wayback Machine. Retrieved 10 March 2023.
  11. ^ C Channel Co., Ltd. (September 12, 2019). "ja:『PRODUCE 101 JAPAN』とのコラボステージ決定！9月21日(土)に101人の練習生が「SUPER C CHANNEL 2019」の会場に勢ぞろい！" [Collaboration stage with "PRODUCE 101 JAPAN" decided! 101 trainees will be at the "SUPER C CHANNEL 2019" venue on Saturday, September 21st!] (in Japanese). PR Times. Archived January 25, 2022 at the Wayback Machine. Retrieved October 6, 2023.
  12. ^ "【紅白リハ】JO1豆原一成、「僕たちの可能性を伝えられたら」 センター務める「無限大」披露で" (in Japanese). Oricon. 29 December 2023. Archived August 31, 2023 at the Wayback Machine. Retrieved 31 August 2023.
  13. ^ "JO1豆原一成『めざましテレビ』マンスリーエンタメプレゼンター就任「フルパワーで頑張ります」" (in Japanese). Oricon. 28 October 2020. Archived January 28, 2021 at the Wayback Machine. Retrieved 10 March 2023.
  14. ^ "JO1豆原一成と般若出演、人気俳優×吉本タレント×クリエイターが集結したオムニバス映画公開決定" (in Japanese). Music Natalie. 10 December 2020. Archived February 4, 2021 at the Wayback Machine. Retrieved March 10, 2023.
  15. ^ "JO1豆原一成の夢叶う！「劇場版 仮面ライダーリバイス」でハイジャック犯に立ち向かう" (in Japanese). Eiga Natalie. 13 June 2022. Archived July 17, 2022 at the Wayback Machine. Retrieved 13 March 2023.
  16. ^ "仮面ライダーキマイラ" (in Japanese). 仮面ライダー図鑑. Archived February 3, 2024 at the Wayback Machine. Retrieved 3 February 2024.
  17. ^ "劇場版「リバイス」出演のJO1豆原一成がスピンオフ主演！橋本祥平はキマイラに変身" (in Japanese). Eiga Natalie. 21 June 2022. Archived July 13, 2022 at the Wayback Machine. Retrieved 13 March 2023.
  18. ^ "高山一実、NHKドラマ初主演 JO1豆原一成&山之内すず共演の夜ドラ『超人間要塞ヒロシ戦記』来年2月放送" (in Japanese). Oricon. 28 November 2022. Archived November 28, 2022 at the Wayback Machine. Retrieved 13 March 2023.
  19. ^ "JO1・豆原一成、自身が演じる役柄について語る「今まで演じた役の中で一番難しかった」＜超人間要塞ヒロシ戦記＞" (in Japanese). The Television. 13 February 2023. Archived February 3, 2024 at the Wayback Machine. Retrieved 3 February 2024.
  20. ^ "神木隆之介主演「海に眠るダイヤモンド」に新キャスト8名、JO1豆原一成が日曜劇場デビュー" (in Japanese). Eiga Natalie. 15 September 2024. Archived September 16, 2024 at the Wayback Machine. Retrieved 17 October 2024.
  21. ^ "JO1豆原一成、故郷・真庭大使就任 "20歳の集い"で語った夢かなう「心からうれしい」" (in Japanese). Oricon. 11 February 2025. Archived March 13, 2025 at the Wayback Machine. Retrieved 11 February 2025.
  22. ^ "JO1豆原一成が特攻服姿に！あの不良マンガ「BADBOYS」実写映画化で初主演決定" (in Japanese). Music Natalie. 7 January 2025. Archived January 21, 2025 at the Wayback Machine. Retrieved 8 January 2025.
  23. ^ "JO1豆原一成が市毛良枝と映画ダブル主演、祖母との日々の中で夢を見つける大学生役". Music Natalie. 28 May 2025. Retrieved 28 May 2025.
  24. ^ Peaks on the Billboard Japan Download Songs chart: * "Not Puppy Love": "June 30, 2025". Billboard Japan. Archived June 25, 2025 at the Wayback Machine. Retrieved June 25, 2025.
  25. ^ "週間 デジタルシングル（単曲）ランキング 2025年06月30日付" (in Japanese). Oricon. Archived 25 June 2025 at the Wayback Machine. Retrieved 25 June 2025.
  26. ^ "Works Information Database" (in Japanese). JASRAC. Retrieved 31 May 2025. When searching, put "MAME" under 著作者名 (Author's name) and "LAPONEエンタテインメント" under 出版者名 (Publisher's name).
  27. ^ "豆原一成（JO1）、オリジナルソング 「Not Puppy Love」に"大人になった自分の想い"込める" (in Japanese). Billboard Japan. 10 January 2025. Archived April 8, 2025 at the Wayback Machine. Retrieved 8 April 2025.
  28. ^ "JO1・豆原一成、母の日に最高の贈り物「全国のお母さんにも、届いたらうれしいな」 オリジナルソング「ママへ」公開" (in Japanese). Oricon. 11 May 2025. Archived May 11, 2025 at the Wayback Machine. Retrieved 11 May 2025.
  29. ^ "JO1主演「ショート・プログラム」ビジュアル&配役が解禁、過去コンテンツも続々配信" (in Japanese). Eiga Natalie. 14 February 2022. Archived February 25, 2022 at the Wayback Machine. Retrieved 2 March 2022.
  30. ^ "JO1豆原一成が彼女持ちの大学生役に、川口ゆりな演じる幼馴染を優しく見守る" (in Japanese). Music Natalie. 10 April 2023. Archived April 3, 2024 at the Wayback Machine. Retrieved 3 April 2024.
  31. ^ "小池栄子主演「ラフな生活のススメ」にJO1豆原一成、松本穂香が仲間入り 脚本はAマッソ加納ら" (in Japanese). Eiga Natalie. 29 May 2023. Archived July 28, 2023 at the Wayback Machine. Retrieved 11 July 2023.
  32. ^ "『JO1』豆原一成&與那城奨が"最高の休日を満喫" 地上波初の冠番組、テレ東系「豆と奨の最高の休日 JO1 ダフルツアー」14日放送" (in Japanese). Chunichi Shimbun. 9 September 2024. Archived September 9, 2024 at the Wayback Machine. Retrieved 17 October 2024.