https://soyogi-fractal.com/
梵そよぎキービジュアル

NEWS

Latest News from Soyogi Fractal

ABOUT

What is Soyogi Fractal?

Concept

From Voice to the World ——
A fractal co-created by humansyou and AI

This character project is built around the voice synthesis software “Soyogi Soyogi,” based on the voice of Yuki Kaji.
The concept was born from Kaji’s own wish to create a space where anyone—professional or amateur—can freely create what they love with like-minded people, without constraints.

Just like a geometric figure—a fractal—this project aspires to be a creative unit where creators with shared ideals come together to create works that, when viewed from above, weave a completely new form that has never existed before.

As the first step, a crowdfunding campaign was launched to develop a singing voice synthesis software featuring “Soyogi Soyogi.”
With the support of many backers, the project partnered with the next-generation synthesis engine “CeVIO AI,” and the release of a high-quality voice synthesis product was confirmed.

Going forward, “Soyogi Soyogi” will continue to be the centerpiece of the project, with collaborations with creators to produce videos and music, expanding the circle of creation as a new entertainment platform.

We hope you’ll continue to follow and support both “Soyogi Fractal” and “Soyogi Soyogi.”

Discover More

KEY PERSONS

  • PRODUCER:

    Yuki Kaji

    In 2023, he launched “Soyogi Fractal” to commemorate his 20th anniversary as a voice actor. He continues to be active in a wide range of fields, including anime, dubbing, radio, narration, film, and theater. He is the first and only voice actor to ever receive the Best Lead Actor Award at the Seiyu Awards for two consecutive years. His voice is said to carry the soothing quality of “1/f fluctuation,” bringing peace to the brain and heart.

  • CHARACTER DESIGNER:

    Mai Yoneyama

    After graduating from an animation school, she worked as an animator at GAINAX and TRIGGER. Since 2017, she has also been active as an illustrator, creating striking works for commercials and music videos. In 2019, she held her first solo exhibition, “SHE,” followed by “EYE” in 2023, gaining recognition in the art world as well. For this project, she is in charge of character design.

  • THEME SONG COMPOSER:

    Hiroyuki Sawano

    He actively works in composing music for dramas, anime, and films, as well as producing and arranging songs for artists. His vocal-focused project, SawanoHiroyuki[nZk], launched in spring 2014. As a producer, he is known for his work with SennaRin and NAQT VANE. For this project, he composed the main theme.

PROFILE

About Soyogi Soyogi

Soyogi Soyogi

An alternate-world version of Yuki Kaji, born from the gift of “voice” and “words.” A character whose personality forms and grows through collaborations with various creators.

(Character Design: Mai Yoneyama)

  • PLAY

    Self Introduction
    00:46
  • PLAY

    Self Introduction (Emotional)
    00:46
  • PLAY

    Happy Birthday (Singing)
    00:43
  • PLAY

    Twinkle Twinkle Little Star (Harmony)
    00:43

LIBRARY

Content Created by Soyogi Fractal

COMICS

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 1: The Day It All Began

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 2: More Importantly...

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 3: What Makes AI

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 4: The Proposal

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 5: Let’s Give It a Try

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 6: Dividing the Work

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 7: The Big Brother from the Craft Club

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 8: Starting with the Form

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 9: A Body Made of Cotton

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 10: My Name.

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 11: People Watching

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 12: The Soyogi Booth is Complete

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 13: The Special Me

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 14: A New Toy

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 15: A Weird Dog

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 16: Let’s Stop Thinking

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 17: Nothing to Put on the Shelf

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 18: A Dog Being a Dog

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 19: My Geeky Big Brother

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 20: "Details Unknown"

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 21: Crisis

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 22: Playing Dead Like a Plushie

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 23: Sit Down

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 24: Report. Inform. Ask.

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 25: Introducing Myself

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 26: Housework Manual

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 27: Hologram Food

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 28: The Art of Internet Etiquette

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 29: Roommate

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 30: All Kinds of Changes

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 31: Check

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 32: My First Errand

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 33: Déjà Vu

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 34: Analog Shopping

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 35: Same as Always

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 36: Mysterious Dog

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 37: Report

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 38: The Saionji Family

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 39: The Visitor

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 40: Cute Things

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 41: Trending Things

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 42: Short Stay?

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 43: Father Comes Home

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 44: Mobile Device

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 45: Similar Things

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 46: Near-Futuristic

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 47: 9 a.m.

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 48: Soyogi in Transit

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 49: The Knowledgeable Dog

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 50: A Day in Yukari

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 51: A Day in Soyogi

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 52: A Day in Yoshitsune

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 53: A Day in Kai

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 54: A Day in Kei

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 55: A Day in Holmes

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 56: A Day in ??

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 57: Saionji Castle

Story: Yuta Taneda Original Concept: Yuki Kaji Soyogi Fractal

Episode 58: A Headache Day

VOICE SAMPLES

  • PLAY

    Self Introduction
    00:47
  • PLAY

    Self Introduction (Emotional)
    00:34
  • PLAY

    Happy Birthday
    00:18
  • PLAY

    Twinkle Twinkle Little Star
    00:28
  • PLAY

    Sakura Sakura
    00:43
  • PLAY

    Jingle Bells
    00:40
  • PLAY

    Tanka Reading of 'Soyogi Fractal' by Poet Tatsuya Kinoshita
    00:11
  • PLAY

    Tanka Reading of 'Soyogi Soyogi' by Poet Tatsuya Kinoshita
    00:10

USER GENERATED CONTENT

The “Soyogi Fractal” project supports content and communities created by users. Feel free to post your content created using CeVIO AI or any derivative works with the hashtag <#soyogifractal> on social media and video platforms!

MESSAGES

Support Messages

Here are messages from all those who have supported the “Soyogi Fractal” project.

Mai Yoneyama

Illustrator

I was deeply moved by Kaji-san’s dedication—not only to honing his craft but also to taking on new creative challenges—so I said, “If I can be of help…!” and gladly accepted the role of designer.
It’s a great honor to have given a visual form to Soyogi-san.

We discussed and poured many thoughts into the design together, so I hope you’ll look forward to Soyogi’s future activities.
And please send lots of fan art of Soyogi-san! (laughs)

Hiroyuki Sawano

Composer

I heard about “Soyogi Fractal” from Kaji-san (Mr. Kaji) a few years ago, and I was deeply moved by his strong conviction and determination toward the project. I'm really excited to see how it will unfold from here—and even more so to be involved in the music side of it myself.

This is a project that only Kaji-san (Mr. Kaji) could have brought to life, and I have high hopes for what’s to come!

Hajime Isayama

Manga Artist

To be honest, when I first heard Soyogi Soyogi's voice, I was a little scared. I was amazed at how far the technology had come, but at the same time, I had a feeling that this AI-driven innovation would bring significant impact—not just to the voice acting world, but also to the manga industry.

That said, I don’t think we can or should try to regulate convenient technologies. Rather than resist, Kaji-san (Mr. Kaji)'s bold and swift leap into these still-unknown technologies—almost as if he were trying to tame them—felt courageous and correct to me.

So I wanted to offer my support in whatever way I can.
Kaji-san (Mr. Kaji), please keep going strong!

Showtaro Morikubo

Voice Actor

Kaji-kun (Kaji), who has been leading the industry through his acting, is now taking on experiments and challenges that may define the future of the industry itself through his very presence. That’s how I see it.

How truly dependable he is.

He’s not alone—myself and many other creators are also exploring how we can coexist with the latest technologies. This project is an exciting development!
Show us the future!

Kenichi Suzumura

Voice Actor

As times constantly change, the voice acting industry has gone through many turning points to reach where it is today. The landscape now is very different from when I entered the industry 30 years ago. Not every change went perfectly.

But thanks to those changes and the efforts of countless people facing them head-on, this industry has reached and touched many lives. Change is scary—especially that very first step. It takes tremendous courage.
Because someone takes that first step, we get to see new horizons.
Pioneers are always struggling in silence as they climb over towering walls.

Kaji-kun (Kaji) is one of those pioneers. No one knows what scenery lies ahead.
But I choose to believe something beautiful is waiting, and I live each day with that hope.

Kaji-kun (Kaji), who bravely keeps moving forward without fear of change—keep going!
Let’s see it together! That wonderful view!

Daisuke Namikawa

Voice Actor

As expected of you—so fast! A true child of the times!
As someone working in the same industry, I’ve been thinking about a lot of things too, and Kaji-kun (Kaji) is already at the forefront.

I hope you’ll find even more fun and creativity in this new world.
Kaji-kun (Kaji)’s voice will never fade—it’s eternal!

Makoto Shinkai

Anime Director

I'm always moved by Kaji-kun (Kaji)’s constant efforts to expand the possibilities of entertainment.

I’m truly looking forward to the future of “Soyogi Fractal”!

Marina Inoue

Voice Actor

I’m honored to support my comrade Kaji-kun (Kaji) in this bold new challenge.
How will 'Akuma no Ko' sound through Soyogi’s voice...? I believe this project will be a special one for me as well.

The emotions I felt when I first heard this song were completely different from what I felt when the anime broadcast of 'Attack on Titan' ended.

As I worked on the illustration this time, I listened to the original version of 'Akuma no Ko' over and over again. The more I listened, the more new perspectives I discovered—and again and again, I was moved to tears by different feelings.

I truly hope many people will watch and listen, and that we can all support the future possibilities of Soyogi Fractal together.

Kenjiro Tsuda

Voice Actor

Wow—Kaji-kun (Kaji) is stepping into the world of AI.

Gentle and kind Kaji-kun (Kaji) is wonderful, but seeing him dive headfirst into cutting-edge technology with such aggression is equally fascinating. He fearlessly takes the lead—how incredible.

Will this project become an angel or a devil...? It’s truly intriguing.
I’ll have to sit down and talk to Kaji-kun (Kaji) about it sometime soon.

Ayumu Murase

Voice Actor

Kaji-san (Mr. Kaji) is incredibly sincere and always brings care and integrity to his creative work!
Knowing that he’s stepping into the world of AI—I can’t help but have high hopes.
I’m really looking forward to seeing the beautiful chemistry that will arise from his dreams and everyone’s imagination!

Keiichiro Oura

CEO, Techno-Speech Inc.

We are truly honored to be able to provide the core technologies (AI voice synthesis and AI singing synthesis) for the “Soyogi Fractal” project.
This project, produced by a voice actor themselves, is destined to become a flagship example of “coexistence and co-prosperity between humans and AI” in the field of voice.
We are very excited about what the future holds!

Tetsurō Araki

Anime Director

I’m cheering on Kaji-san (Mr. Kaji)’s “Soyogi Fractal”!
With the singing synthesis software 'Soyogi Soyogi' at its core, Kaji-san (Mr. Kaji)’s boundless creative spirit combined with everyone’s playful energy is sure to create some really fun entertainment!
I’m looking forward to collaborating on something together too!

Yukihiko Tsutsumi

Film Director / Producer

Yuki Kaji, whom I’ve counted on at many critical moments, has launched an AI voice project!
He already possesses a gifted voice that stirs human emotion—and now he's using cutting-edge methods to share that 'treasure' with the world, essentially democratizing happiness. Incredible.
Soon, not just morning alarms, but station announcements, airplane safety briefings, AI characters in film and drama, and even 'Kaji A, Kaji B… Kaji N' may populate the internet spreading happiness everywhere.
A little scary, perhaps.
Regardless, he’s taking on the chaos surrounding AI with his own unique presence!
How amazing is that!
Full support!
Go, Kaji-san (Mr. Kaji)!
If there’s anything I can do to help—I’ll do it! (within reason, haha)

Shinji Higuchi

Film Director

Over the past year, whenever I hear talk about those groundbreaking technologies, I always find myself thinking the same ideas too—but bringing them to life is never easy...
Even just casually bringing it up in a proposal could risk damaging the trust we’ve built so far.
That’s why—it’s exactly why—a project like this starting with Kaji-kun (Kaji) carries so much meaning.

It’s a sensitive topic, but one that absolutely matters. I sincerely wish for its success and wholeheartedly support it!

Akihiro Hino

Level-5 Inc.

This is amazing. It already sounds like Kaji-san (Mr. Kaji) himself is speaking and singing!
I'm really excited to see what Kaji-san (Mr. Kaji) plans to do with this system.

Even as a voice actor, Kaji-san (Mr. Kaji) would often suggest different approaches to acting and think about the work from a creator’s point of view.
So I’m sure this project isn’t just from the perspective of a voice actor, but also from that of a creator with a unique vision.
I’ll be waiting eagerly to see what comes next.
Keep it up!

Shu Takumi

CAPCOM Co., Ltd.

At the heart of a vast creative universe that connects creators and transcends genres stands the brave figure of Soyogi-kun—
This project, constantly pushing beyond boundaries and breaking down walls to challenge new worlds, is exactly what I’d expect from Kaji-san (Mr. Kaji).
To that grand dream, I say—No objections! No delays! And... I’ll sink my teeth into it too!

Genki Kawamura

Producer / Filmmaker / Novelist

A one-of-a-kind project that only Yuki Kaji—who has built countless “worlds” with his voice—could ever bring to life.
"This is my dream, and the project I’m dedicating my life to."
Hearing him speak with such passion, I can’t help but look forward to the new world he is about to create.

Kazuki Nakashima

Playwright

How we interact with generative AI will become a major challenge for those whose profession is artistic expression.
Kaji-kun (Kaji) boldly dove straight into that space.
It’s amazing—so bold. It must come from his youth, his pride as a front-line voice actor, and a strong sense of responsibility.
With top-tier creators like Mai Yoneyama and Hiroyuki Sawano involved, the project will eventually need to stand on its own as a business—and I’m sure Kaji-kun (Kaji) is thinking about that too.
But for now, it’s about just giving it a try.
Rather than resisting new technologies, let’s start by finding the fun in them.
That’s how I interpreted Kaji’s approach—an attitude of wanting to play with the possibilities.
So please, everyone, enjoy this grand 'play' that Kaji-kun (Kaji) has launched. And may this endeavor roll forward in wonderfully unexpected directions.

Yuki Hayashi

Composer

When the unique and irreplaceable voice—carved from the bundle of talent that is Yuki Kaji—becomes a tool accessible to all, what new works will emerge? What kind of change will it bring to the world?
I’d like to witness this moment of transformation while sipping on a strong highball.
I’m sure it’ll give me tons of inspiration for my own music as well, and I’m really excited about that too!
Go Kaji-san (Mr. Kaji)!

Hajime Suzuki

Director, Japan Acoustic Research Institute

Congratulations to Yuki Kaji on 20 years as a voice actor.
I don’t think anyone else places as much emphasis on conveying emotion through voice as he does.
The wealth of experience he has accumulated through countless performances relying solely on voice is irreplaceable, and I believe it will fill the missing piece in projects like this voice synthesis AI initiative. I’m truly looking forward to it.

KAMITSUBAKI STUDIO

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This collaboration was made possible through Yuki Kaji’s participation in our virtual stage play “OTOGIBANASHI.”
We hope everyone will witness the new possibilities that arise through this collaboration with “Soyogi Fractal.”

HoneyWorks

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Congratulations to Kaji-san (Mr. Kaji) on your 20th anniversary as a voice actor,
and on the launch of the “Soyogi Fractal” project!
We’re especially excited about this new creative venture for Kaji-san (Mr. Kaji) and Soyogi Soyogi,
since it involves singing synthesis software—a field we’re also very familiar with.
We’re grateful for our connection from the Confession Executive Committee,
and we hope to collaborate again on new endeavors in the future!

Tatsuya Kinoshita

Poet

On the occasion of his 20th anniversary as a voice actor—a moment when he should be celebrated and receiving gifts—Kaji-san (Mr. Kaji) is instead offering the most valuable thing a voice actor possesses: his voice, through Soyogi Soyogi, to people today and in the future.
This is a generous project that only someone like Kaji-san (Mr. Kaji)—who has a broad heart, drive, passion, and a voice that heals just by being heard—could make possible.
I’m cheering for him.
A joyful future surely lies ahead.