Seki Yumiko

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Seki Yumiko
Seki Yumiko (2018 - Debut)
Kanji 関有美子
Kana せき ゆみこ
Romaji Seki Yumiko
Nickname Chairman/Prez Yumiko (有美子会長)
Yumichan (ゆみちゃん)
Birth Info
Birthdate June 29, 1998  
Birthplace Flag of Japan.png Fukuoka, Japan
Blood type A
Current Age 25 Years Old
Height 167cm
Professional Info
Agency Seed & Flower
Social Networks Official Blog / SHOWROOM / Instagram
Idol Career Info
Former Group Sakurazaka46
Former Team 2nd Generation
Debuted December 2018 / Keyakizaka46 2nd Generation
Graduated April 2023

Seki Yumiko was a member of Sakurazaka46's 2nd Generation.


  • Her audition SHOWROOM number was #40
  • Favorite things: Taking a train or bus while listening to music (especially like a band with a piano), sleeping a lot, seeing idols
  • Favorite food: Ramen (specifically Tonkatsu Ramen)
  • Favorite manga: One Piece, Hunter x Hunter, and Tokyo Ghoul
  • Favorite artist: Kenshi Yonezu
  • Keyakizaka46 oshimen: Watanabe Rika
  • If she were to compare herself to something, it would be a cup.
  • She was a model with the "NEXT MODEL COLLEGE" agency prior to joining Keyakizaka46, and walked for FACo (Fukuoka Asia Collection) Fashion Show.
  • She was an avid fan of Keyakizaka before joining and went so frequently to handshake events that she was recognized by members. She also collected photos of her oshimen, Watanabe Rika.
  • She never danced before joining Keyakizaka.
  • She was a member of the brass band and plays alto saxophone.
  • She is a fan of the SoftBanks Hawks baseball team.
  • She doesn't like smiling with her teeth in photos, but when other members take the photo, her laugh comes out naturally.
  • She is called "Chairman/Prez Yumiko" due to her high-class background. On Episode 244 of Keyakitte, Kakenai? she revealed that she randomly received a MacBook Pro and Saxophone as a gift despite it not being her birthday.
    • However, the title first emerged from being the de-facto leader of the "We love Yuichan Society" (唯衣ちゃんを愛でる会).
  • Her light stick colors used to be white + orange.


Sakamichi Joint Auditions finalist → Keyakizaka46 2nd GenerationSakurazaka46 2nd Generation → Graduation
Passed the Sakamichi Joint Auditions on August 20, 2018
Joined Keyakizaka46 2nd Generation on December 3, 2018
Transferred to Sakurazaka46 2nd Generation on October 14, 2020
Graduated from Sakurazaka46 on April 30, 2023 at the Sakurazaka46 3rd TOUR 2023 (Announcement: December 13, 2022)

Singles Participation

Sakurazaka46 A-Sides

Sakurazaka46 B-Sides

Other Singles

Albums Participation

Sakurazaka46 Albums

Keyakizaka46 Albums

Media Appearances

Variety Shows


Other Links