Kosaka Nao

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Kosaka Nao
Kosaka Nao (2019 - Kyun)
Kanji 小坂菜緒
Kana こさか なお
Romaji Kosaka Nao
Nickname Kosakana (こさかな)
Birth Info
Birthdate September 7, 2002  
Birthplace Flag of Japan.png Osaka, Japan
Blood type O
Current Age 21 Years Old
Height 161.5cm
Professional Info
Agency Seed & Flower
Social Networks Official Blog / SHOWROOM
Idol Career Info
Group Hinatazaka46
Team 2nd Generation
Debuted August 2017 / 2nd Generation
Lightstick Colors
Violet White

Kosaka Nao is a member of Hinatazaka46's 2nd Generation. She is a "Seventeen" exclusive model.


  • Her audition SHOWROOM number was #25
  • Admired Members: Nishino Nanase, Nagahama Neru, Ushio Sarina
    • She calls herself an "Ushio Sarina oshi"
  • Favorite Foods: Hamburger steak (especially tofu burger) with demiglace sauce
  • Favorite Artist: Sumika and GReeeeN
  • Favorite Animal: Dog
  • Best School Subject: Science
  • Hobbies: Watching anime and reading novels, particularly ones that have been made into movies
  • Charm point: Long eyelashes
  • Special skills: Volleyball (blocker), abacus, mental math
  • Catchphrase: I'll run up Osaka, Kosaka, Hintazaka, all three-zaka with all my might!" (大阪、小坂、日向坂、三本坂を全力で駆け上ります! Osaka, Kosaka, Hinatazaka, mihonzaka wo zenryoku de kake noborimasu!)
  • She has an older brother who liked Keyakizaka46.
  • Her nickname (Kosakana) is her name without the 'o' in the end, but also means 'little fish'.
  • She loves reptiles and dinosaurs. The social media accounts created to promote her first photobook were called "Kosakanatops", a portmanteau of "Kosakana" and "Triceratops".
    • In the music video for Tteka, Higashimura Mei picks up a triceratops plushie near the end of the video. The members explained that this plushie was meant to represent Nao, who did not participate in the single due to her hiatus.
  • She is known for having a calm personality.
  • She was inspired to audition for Hiragana Keyakizaka46 after watching the Zepp Namba (Osaka) performance of Hiragana National Tour 2017 in May 2017.
  • She had no dance experience prior to joining the group.
  • Before it was announced who the hosts of Hiragana Oshi would be, the members were asked who they wanted to have as host. Nao was the only member to choose Audrey, the comedy duo who was eventually selected. Her reason was "they are good at talking, so I thought it was sure to be fun if we had them as MC".
    • For this reason she was nominated as co-host Wakabayashi Masayasu's favorite member.
  • She ranked first in the Lucky Girl Ranking 2019 on Hiragana Oshi.
  • She is close friends with Kamimura Hinano. On a segment on HINABINGO!, chose Hinano as her ideal little sister and Hinano chose her as her ideal big sister.
  • She is close friends with Kanemura Miku, as they are of the same generation and only three days apart in age. Their duo name is called NaoMiku.

Group History

Hiragana Keyakizaka46 2nd GenerationHinatazaka46 2nd Generation
Joined Hiragana Keyakizaka46 2nd Generation on August 15, 2017
Transferred to Hinatazaka46 2nd Generation on February 11, 2019




  • On May 19th, made her runway modeling debut at the "Rakuten Girls Award 2018 SPRING/SUMMER"
  • On June 1st, became an exclusive model for "Seventeen" magazine.


  • On February 11th, it was announced that Hiragana Keyakizaka46 would become a new independent group, Hinatazaka46. Nao would therefore become part of Hinatazaka46's 2nd Generation.
  • On March 27th, was selected as center for Hinatazaka46's debut single, Kyun. She would continue on in the center role for all single A-sides until Kimi Shika Katan in May 2021.
  • On March 30th, appeared as a model at the "Mynavi presents 28th Tokyo Girls Collection 2019 SPRING/SUMMER".
  • On May 18th, appeared as a model at the "Rakuten Girls Award 2019 SPRING/SUMMER".
  • On September 7th, appeared as a model at the "Mynavi presents 29th Tokyo Girls Collection 2019 FALL/WINTER".
  • On November 6th, starred in Thinking Dogs' music video "Spiral".
  • On November 15th, starred in the movie "Kyoufu Ningyo" (恐怖人形 Horror Doll).
  • On December 23, served as image model for Nishizen's new furisode brand, "Kosaka Nao -Kosaka Nao- Furisode".


  • On January 15th, starred as Sada Yuria in the Hinatazaka46 drama series DASADA.


  • In April, began a regular radio appearance on the program "Hoshi no Dragon Quest presents Hinatazaka46 Kosaka Nao's 'Kosakana Radio'".
  • On June 26th, announced her hiatus from all activities due to poor physical condition.
  • On June 29th, released her first photobook, Kimi wa Dare?. The book was printed at 150,000 first edition copies, the highest of any Shueisha or Sakamichi Series photobook.


  • On March 4th, returned from her hiatus and resumed activities with Hinatazaka46.


  • On October 6th, started her radio program, Quest For The Future.
  • In December, appeared in a few commercial clips for Sony Sompo together with Kamimura Hinano.

Single Participation

Hinatazaka46 A-Sides

Hinatazaka46 B-Sides

Keyakizaka46 B-Sides

AKB48 B-Sides

Album Participation

Hinatazaka46 Albums

Keyakizaka46 Albums


Media Appearances

Stage Plays

  • AYUMI (あ ゆ み) (2018)
  • Zambi (ザンビ) (2018)

Variety Shows



  • Kyoufu Ningyo (恐怖人形) (2019)
  • Hinomaru Soul 〜Butaiura no Eiyuutachi〜 (ヒノマルソウル〜舞台裏の英雄たち〜) (2021)

Music Videos


  • Hinatazaka46 no All Night Nippon 0(ZERO) (2019 – )
  • Hoshi no Dragon Quest presents Hinatazaka46 Kosaka Nao no Kosakana Radio (星のドラゴンクエストpresents 日向坂46小坂菜緒の「小坂なラジオ」) (2021 - 2022)
  • J-WAVE Quest For The Future (2023 – )

Other Links


Kosaka Nao (2019 - Kuroi Hitsuji)
Kosaka Nao (2018 - Hashiridasu Shunkan)
Kosaka Nao (2018 - Glass wo Ware!)
Kosaka Nao (2017 - Kaze ni Fukarete mo)
1st Generation
Kato ShihoSaito KyokoSasaki KumiSasaki MireiTakase ManaTakamoto AyakaHigashimura Mei
2nd Generation
Kanemura MikuKawata HinaKosaka NaoTomita SuzukaNibu AkariHamagishi HiyoriMatsuda Konoka
3rd Generation
Kamimura HinanoTakahashi MikuniMorimoto MarieYamaguchi Haruyo
4th Generation
Ishizuka TamakiKonishi NanamiShimizu RioShogenji YokoTakeuchi Kirari
Hirao HonokaHiraoka MitsukiFujishima KahoMiyachi SumireYamashita HarukaWatanabe Rina