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Tanaka Kouko (田中皓子) is a Japanese pop singer and Idol managed by STU. She was a first generation member of STU48 who graduated on March 31,2021.
- Birth Name: Tanaka Kouko (田中皓子)
- Nicknames: Kokko (こっこ), Kouko (こーこ)
- Birthdate: June 16, 1996
- Birthplace: Saga, Japan
- Blood Type: A
- Height: 159cm
- Bands / Groups:
- NEXT GIRLS (2014–2015)
- STU48 (2017–2021)
STU48 Song Participation
|Bokutachi wa Sinbad da|
|Kaze wo Matsu||Kaze wo Matsu|
|Yagate Nanohana ga Saku Koro||20th Century Born Members|
|Dareka to Itai||ToroMichuKokko|
|Daisuki na Hito||Daisuki na Hito|
|Koi wa Kebyou Chuu||Charming Trip|
|Mubou na Yume wa Sameru Koto ga Nai||Mubou na Yume wa Sameru Koto ga Nai|
|Setouchi no Imouto|
AKB48 Song Participation
|11gatsu no Anklet||Omoidasete Yokatta||STU48|
|Jabaja||Pedal to Sharin to Kita Michi to||STU48|
|NO WAY MAN||Soredemo Kanojo wa||Otona Senbatsu 2018|
- Currently a first generation member of STU48, she announced her graduation on December 23, 2020.
- Prior to STU48, she was a member of the Saga-local idol group NEXT GIRLS from 2014 to 2015.