Koki Tanaka

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Koki Tanaka
Native name 田中聖
Born (1985-11-05) November 5, 1985 (age 29)
Origin Chiba, Chiba, Japan
Genres J-pop, J-rock, Indie rock
Occupation(s) Singer–songwriter, actor
Instruments Vocals, guitar
Years active 1998–present
Labels Natural Ace Records (current), J Storm (former)
Associated acts INKT, KAT-TUN
Website inkt.asia/pc/
Notable instruments
guitar, piano, shamisen

Koki Tanaka (田中聖 Koki Tanaka?, born November 5, 1985) is a Japanese singer–songwriter, actor and former Japanese idol, he was a member of Jpop idol boyband KAT-TUN from their debut until September 30, 2013 when his contract with Johnny & Associates (the company that manages KAT-TUN) was terminated. When he was a member of KAT-TUN, he was recognized as the rapper in the group and has a hip-hop-influenced style. Out of the other members, Tanaka was most often paired up with Yuichi Nakamaru and they even formed a comedy duo 'TaNaka'.

On September 30, 2013 his contract with Johnny & Associates was officially terminated due to several contract violations.[1] In November of the same year, he formed his own Indie rock band called INKT[2] and they finally released their debut album on November 8 of 2014.[3]

Tanaka can play several instruments, his main instrument is the guitar, he can also play the piano and the shamisen. He wrote most of the rap lyrics for KAT-TUN's songs and his solos, he went by the pen-name of "JOKER". Now with INKT, he writes all the band's songs under his name 'KOKI'.

As an actor, Tanaka has appeared in a string of Japanese TV series and movies and has won 2 awards for his acting work in My Boss My Hero.

Tanaka loves to design things and is very artistic, he has a talent for sewing and he designs his own apparels.

Early life[edit]

Born in Chiba, Chiba prefecture; Japan on November 5, 1985, Tanaka is the second oldest of 6 siblings, all brothers and raised by their single mother. His younger brother Juri is also an actor and signed with Johnny & Associates, Juri along with Tanaka's youngest brother Subaru even appeared alongside Tanaka in the first episode of the TV series Tokkyu Tanaka 3 Go in which Tanaka played the lead role. His younger brother Hyouga is also an actor, and Tanaka's older brother is named Kazunaru.

Before Tanaka was born, his mother thought he would be a girl, so she thought of the name Maria (Saint). But he turned out to be a boy instead, so the Kanji letter of his name '聖' was kept, but its pronunciation was changed to “Koki” (“Koki” also means “Saint” in Japanese). Furthermore, when he was little his face was so cute and feminine that he was often mistaken for a girl.

Tanaka joined Johnny & Associates in 1998, he once stated the reason why he applied was “My mother sent the application form behind my back. So I went to the audition without knowing anything at all. She told me it was because my cousin applied too. Therefore, we went to the audition together. But in the end, my cousin failed, while I passed.”

Tanaka graduated from Horikoshi High School, and eventually went to study at Josai International University, but he quit halfway. He loves animals so much that he originally wanted to become a veterinarian.


For releases as a member of KAT-TUN, see KAT-TUN discography.


Studio Albums

Year Album information Chart position (debut week) Sales
2014 INKT
  • Format: CD, DVD
  • Release date: November 8, 2014
  • Record label: Natural Ace Records
  • Language: Japanese
17[5] JPN:
2015 Saisarisu[6]
  • Format: CD, DVD
  • Release date: April 25, 2015
  • Record label: Natural Ace Records
  • Language: Japanese

Live performances[edit]

For activities as a member of KAT-TUN, see KAT-TUN#Other activities.


This is a list of live concerts Tanaka performs in with his band INKT.

Year Title Role Venues & dates
2014 INKT Fan Meeting Vol.1 Lead performer Shinagawa Prince Hotel Stellar Ball; Tokyo (November 6)[7]
2015 INKT 1st Live ~ The Birth of INKT Lead performer TSUTAYA O-WEST; Tokyo (January 18),[8]

BIGCAT live house; Osaka (February 21)[9]

2015 INKT one-man Live ~ Painting with INKT Lead performer EX Theater Roppongi (May 5),[10]

Stage shows[edit]

Year Title Role
2001 - 2003 Dream Boys Dancer
2002 Shock Dancer
2004 Dream Boys Supporting role & dancer
2006 Summary of Johnny's World Main cast
2007 Dream Boys Lead role
2008 Dream Boys Lead role
2011 Dream Boys Lead role



Year Title Role
2000 Colorful main role
2012 Ooku ~ Eien supporting role
2014 Sanbun no Ichi (One Third) main role


TV series
Year Broadcast Title Role
1999 NTV Nekketsu Ren-ai Dou
1999 NTV Kowai Nichiyobi
1999 NTV Kowai Nichiyobi ~Shinsho~
2000 NTV Tenshi ga Kieta Machi
2000 NTV Kowai Nichiyobi 2000
2001 TBS Never Land Shigehisa Iwatsuki (supporting role)
2006 NTV Takusan no Ai wo Arigato
2006 NTV My Boss My Hero Kazuya Manabe (main role)
2006 NTV Tatta Hitotsu no Koi Kou Kusano (main role)
2007 NTV Tokkyu Tanaka San Go Ichiro Tanaka (lead role)
2009 TV Asahi Hissatsu Shigotonin 2009 Ren (main role, episodes 13 - 22)
2012 TBS Ooku ~ Tanjou Gyokuei (main role)
Drama SPs (special TV movies)
Year Broadcast Title Role
2005 NTV Kindaichi Shōnen no Jikenbo 2005 supporting role
2007 TV Asahi Byakkotai Gisaburo Shinoda & Yusuke Shinoda (main role)
2010 NTV Rikon Syndrome (Divorce Syndrome) main role
2010 TV Asahi Hissatsu Shigotonin 2010 SP Ren (main role)
2012 TV Asahi Hissatsu Shigotonin 2012 Ren (main role)
2013 TV Asahi Hissatsu Shigotonin 2013 Ren (main role)


For awards won as a member of KAT-TUN, see KAT-TUN#Awards.


External links[edit]