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Kei Tsuzuki is one of the Idols available to produce at 315 Productions. He is a pianist who formed the Idol Unit, Altessimo, with Rei Kagura.

Kei Tsuzuki
都築 圭
"......Me, an idol...?"
Member of
SideM Character Data
Age: ??
Height: 182 cm
Weight: 54 kg
Shoe Size: 27 cm
Birthday: April 2
Blood Type: O
Hobbies: None
Skills: Piano
Writing Hand: Left
Horoscope: Aries
Hometown: Berlin
Ex-Job: Pianist
Attribute: Mental
Seiyuu: Shunichi Toki

The mysterious young man who loves music more than anything!

Card Data (Mobage) Card Data (LOS) Conversations Magazines



Kei is a former composer. Vague, elusive, and with age unknown, he carries an air of mystery about him. Though his talent in music is prodigal, he cares for nothing else. Kei has no confidence in standing center stage, and is far from proactive in his job duties. However, since working with Rei, this attitude has begun to change.

(From 2nd Anniversary Book)


Reasons for Becoming an Idol
So I can live.
Music is all I have.
Personal Motto
“Poco a poco.” Go little by little, in all things.
Comments for the Future
I want to see it with my own eyes.
The potential within my music, that moment of life within the sounds born from this very hand. I have decided to become an idol for that very reason, but...
Well, let’s just see how this plays out.
Comments about Unit Members
Rei’s taste in violins is magnificent, is it not? Why, he could make even a trite pop song sound as though it came from the heavens! ...Alas, he’s far too uptight... If only I could get him to loosen up ju~st a bit...


Event and Gacha HistoryEdit



Birthday CommentsEdit

Year Idol Comment Idol Unit Comment
2016 How curious. Why am I being asked about my age so often today... Ahh, it's my birthday. I see. So how old am I, actually? Well... I don't know the answer to that myself. Kei My birthday? Ah, I see... So... would you happen to know the month and day today? It is such a bother to remember the date.
Rei Today is April 2nd! I guess wishing Kei-san good tidings through words was pointless... Would you like to listen to me play your celebration song?
2017 Yes, today is my birthday. Hehe, I could not possibly forget after you and Rei constantly kept reminding me of it. My age? I am... Hm? Goodness, how old am I? Kei Fufu... birthdays certainly are interesting. I can hear a myriad of sounds around me. Just listening to it all so carefully has made me quite sleepy... good night... zzz...
Rei Ah, don't 'zzz' right now please! I practiced so hard to play your birthday song too... Please wake up, Kei-san!
2018 I wonder how many times I've had someone celebrate my birthday like this. 1, 2, 3... all this counting has made me tired. I'll be sleeping right here, so please continue counting for me. Good night... Kei Thank you for another magnificent birthday song this year. Your sound is much more gentle and comfortable compared to last year. I can feel how much you've improved, Rei-san.
Rei I am able to grow because you are together with me, Tsuzuki-san. Please allow me to play one more song as my token of thanks for what you do for me every day.
2019 is my birthday? I still don’t keep up with these kinds of things, but I am delighted to have people here celebrating for me. Thank you, Producer san. Kei Aah….how wonderful..your song on your violin is lovely as well, Rei san. I feel as if a warm spring breeze is around me.
Rei I’m happy to hear that. Happy Birthday, Tsuzuki san. Here’s to another wonderful year.