Kazuki Tsukumo

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Kazuki Tsukumo
Kazuki SideM Icon.png
SideM Character Data
Name: 九十九一希 (Tsukumo Kazuki)
Voice actor: 比留間俊哉 (Hiruma Shunya)
Age: 19
Height: 178 cm
Weight: 64 kg
Shoe Size: 26.5 cm
Birthday: October 13th
Blood type: A
Hobbies: Camping, Writing
Skills: Remembering books after reading them once
Recognizing edible mushrooms
Handedness: Right
Horoscope: Libra
Hometown: Gifu
Ex-Job: Novelist
Card Type: Intelligent
Image Color:     
Kazuki sig.png

Kazuki Tsukumo (九十九一希 Tsukumo Kazuki) is one of the available idols in the mobile game THE iDOLM@STER SideM. Kazuki was originally voiced by Tatsuya Tokutake (徳武竜也 Tokutake Tatsuya) until he retired from voice acting on December 31st, 2019. On January 28th, 2020, Shunya Hiruma (比留間俊哉 Hiruma Shunya) took over the role.


SideM Biography

"Is this... a world I can't experience from books alone?"

Character Profile

Character Description

Kazuki is a quiet and calm former novelist. He is quite observant and often takes notes in order to help him see things more clearly. Kazuki prefers to be alone, but also enjoys the company of his unit, F-LAGS. Because of his imagination, he sometimes makes up stories about others. He is very quick at reading, as shown when he read many thick books in one week despite all of his work and is also good at memorizing books. After being inspired by Ryo Akizuki, who started performing as a male idol, Kazuki became an idol in order to change himself and to show the world his true self.

Kazuki has social anxiety and is often seen standing off to the side at parties and going out of his way to avoid crowds. However, Kazuki will go somewhere if Ryo and Daigo are going too. Ryo and Daigo can also tell when Kazuki is feeling uncomfortable and will act silly to try and make him feel better, like in the Halloween Live 2015 event where they surprise him with big, costume hats to make him smile.

Kazuki has medium length orange hair that covers his left eye. His most common outfit is a green-gray shirt and green-yellow scarf, and his F-LAGS outfit consists of a white peaked cap and unbuttoned admiral jacket over a striped shirt.

Game Discography



Song Discography

Recorded Solo Songs

Recorded Group Songs

Trivia and Fan Culture


  • Kazuki is the first of the SideM characters to have a recasting for his voice, due to his original seiyuu (Tatsuya Tokutake)'s full retirement from character work in late 2019.
    • This also makes him the second character in the entire iDOLM@STER franchise after Yukiho Hagiwara to have different voice actors (not counting Xenoglossia, which entirely features new voice actresses).

Fan Culture

  • Kazuki is part of the unofficial unit 19歳組 (lit. 19-year-old group, often shortened to 19gumi by English-speaking fans), alongside Kuro Kiyosumi and Sora Kitamura. The three share similar themes of being true to themselves due to their age and have a joint calm and mature aura. They featured in an event together in Write for someone ~A Reminiscent Sky~, fittingly set in 19th century London.

Character Gallery


SideM Cards