TasainaProject Wikia
Yamamoto Sadako
(やま)(もと) (さだ)()
Yamamoto Sadako's avatar, 2018
Nickname Yama-chan (やまちゃん?)
Hajime (ハジメ?)
Birthdate February 25, 1997 (age 25)
Bloodtype A
Height 152.4cm
Professional Information
Years Active 2015 - present
(6 years, 11 months and 6 days)
Group NGY48
Team Sapphire NGY48
Generation 1st Generation

Yamamoto Sadako is the Captain of Sapphire NGY48. She announced her graduation on February 23, 2018.


みんなの友達やまちゃんこと山本貞子です。 よろしくお願いします!
Minna no tomodachi Yamachan koto Yamamoto Sadako desu. Yoroshiku onegaishimasu!
(Everyone's friend Yamachan also known as Yamamoto Sadako. Nice to meet you!)


  • Member Color: Blue
  • Motto: Kanshyashite nya
  • Hobbies: Singing
  • Specialty: Piano, Violin, Sleeping~ Procrastinating
  • Favorite animal: Spotted Lady Jellyfish
  • Favorite artist: Hayao Miyazaki
  • Favorite movie: Spirited away
  • Favorite book: Wicked
  • Favorite season: Winter
  • Favorite place in the house: My room
  • Favorite food: Mochi
  • Disliked food: Anything spicy
  • Superstitious practices: None, but i do have a habit of double tapping my pen to a paper after writing sentences.
  • Future ambition: Become the best idol!!!

t-smile Senbatsu Elections

t-smile Janken Tournaments


t-smileMRK43 & MeirounaTeam R & Meirounat-smile & MeirounaTeam Asagao & MeirounaNGY48 & Team Asagao & MeirounaTeam N & Team Asagao & MeirounaSapphire NGY48
Joined t-smile on September 06, 2015
Had a concurrent position in Meirouna from September 16, 2016 to June 11, 2017
Transferred to MRK43 on September 17, 2016
Promoted to Team R on September 17, 2016 (Team R Formation)
Transferred back to t-smile upon MRK43's disbandment on February 20, 2017
Promoted to Team Asagao on March 10, 2017 (Team Asagao Formation)
Transferred to NGY48 on April 2, 2017
Promoted to Team N on April 4, 2017 (Team N Formation)
Had a concurrent position in Team Asagao from April 2,2017 to June 11, 2017
Transferred to Sapphire NGY48 on November 18, 2017

Singles participation

NGY48 B-Sides
t-smile A-Sides

Albums Participation

NGY48 Albums