Kei Tsuzuki

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Kei Tsuzuki
SideM character data
Name: 都築 圭 (Tsuzuki Kei)
Voice actor: 土岐隼一 (Toki Shunichi)
Height: 182 cm
Weight: 54 kg
Shoe Size: 27 kg
Birthday: April 2nd
Blood type: O
Hobbies: None
Skills: Piano
Handedness: Left
Horoscope: Aries
Hometown: Berlin
Ex-Job: Pianist
Card Type: Mental
Image Color:     
Kei sig.png

Kei Tsuzuki (都築圭 Tsuzuki Kei) is one of the available idols in the mobile game THE iDOLM@STER: SideM. He is voiced by Shunichi Toki (土岐隼一 Toki Shunichi).



Kei is a calm and mysterious composer and musician. He considers music to be all that he has, and focuses solely on it; he believes all sounds to be beautiful and finds enjoyment in little things. Kei hopes with his idol career that he can continue to explore music and move people with his songs.

He is quite carefree, having chosen to become an idol solely based on Rei’s music, and often appears relaxed. Kei sometimes enters ‘his own world’ when dazed by music, causing him to continue singing or playing even after the song has ended. Kei falls asleep easily and is forgetful, not even remembering his own age.

Because of his airy attitude, Rei often has to keep Kei in check. He can appear irresponsible due to his reliance on Rei, but he cares deeply for him.


Kei’s mother is German and his father is Japanese. When he was young, they divorced and his mother took him to live in Germany, where he grew up in Berlin. There, he had a quiet life, living in an apartment where there was a concert hall nearby. Listening to the music played ‘brought color’ into Kei’s life, and inspired him to become a composer. He had a friend in Berlin who suddenly disappeared, affecting his current state.

Kei provided the debut song for the legendary songstress idol. Writing music for the songstress was his everything; after she suddenly retired, he had no joy in life until he met Rei and Producer.

In Japan, Producer scouted Kei while he was singing in the rain. At the recording studio, he found himself amazed by Rei’s violin playing and regained his passion and happiness.

Game Discography



Song Discography

Image songs

Sanctuary World

Recorded Solo Songs

Recorded Group Songs

Trivia and Fan Culture


  • Opposed to the majority of 315 Production loving food, his favorite food/beverage is water, and even likes to try out different brands.
  • Because of his disconnection with the world, the other idols wonder if he is an alien.

Fan Culture

Character Gallery

SideM Cards