The studio · Sakuragaoka, Shibuya

A small Japanese studio, weirdly serious.

Bit7 Labs is 128 people working four floors above a sake shop in Sakuragaoka, Shibuya. We share one espresso machine and one pact — nothing leaves the floor that we wouldn't put in our own homes.

A letter, on the wall

"We are starting something quiet."

On the morning of 14 February 2020, three of us signed a one-page document and stuck it to the inside of an empty studio door in Sakuragaoka. The first sentence read: we are starting something quiet.

The page laid out three things we wanted to be true about the company we were beginning. That we would treat adult intimacy as a serious subject — not a joke, not a transgression. That we would treat privacy as the product, not the disclaimer. And that we would build at the pace required by the materials, the model, and the people we hired, and not by capital.

Six years later, the page is still on the door. The studio is larger, the catalog is longer, and three waves have shipped — but the language has not moved.

Mei, Toshi, and Aren · principals

128
People · the floor
11
Disciplines
42
Markets shipped
1
Espresso machine
Principals

Three signatures on the door.

Co-founder · Principal

Mei Sasaki

Voice & dialogue · Ex-Sony AI

Mei is the lead on Aria-7 and the personality console. Trained as a phonologist; spent seven years at Sony's research lab making things that talked back.

Co-founder · Principal

Toshi Hirano

Embodied · Ex-Honda Robotics

Toshi runs the embodied side. Twelve years at Honda Humanoid Robotics; lectured on soft-tissue robotics at the University of Tokyo until 2023.

Co-founder · Principal

Aren Tóth

Privacy & ethics · Ex-Mozilla

Aren wrote the Bit7 Privacy Paper. Came in via Mozilla and a stint as a clerk at the Hungarian data protection authority. Reads regulation for fun.

Inside the floor

Four wings, one corridor.

The atelier is laid out around a single hallway with high windows. You can stand at the espresso machine and see all four wings if the doors are open.

Wing 01

Voice studio

Anechoic recording booths, listening rooms, and the dialogue annotation team. The most quiet wing — often the most opinionated.

38 people · Mei leads
Wing 02

Sculpting bay

Where embodied units are sculpted, cast, tinted, and finished. Smells faintly of pigment, daylight, and good silicone.

42 people · Toshi leads
Wing 03

Sensor lab

Capacitive arrays, thermal stacks, the firmware team. The wing where the lights stay on the latest.

26 people · Yui Sato leads
Wing 04

Listening room

Where the studio meets owners. Demos, fittings, custom commissions. Booked by appointment only.

12 people · Aren leads
Disciplines on staff

Eleven things we do, daily.

Multimodal ML Voice acting Phonology Industrial design Soft robotics Silicone sculpting Pigment chemistry Sensor systems Privacy engineering Clinical psychology Fragrance composition
Studio timeline

Six years, in eleven lines.

2020 · 02

Bit7 Labs is founded

Mei, Toshi and Aren sign a one-page document on a studio door in Sakuragaoka. Eight people on the floor.

2020 · 11

The first Aria-1 prototype speaks

Three sentences, six languages, late on a Friday. The studio plays them on repeat for a week.

2021 · 06

Casting bay opens

The first silicone formulations are mixed in-house. The team grows from twelve to twenty-eight; the espresso machine is replaced.

2022 · 03

Privacy Paper V1 is signed

The original ethics charter is locked; the three external reviewers are seated for the first time.

2022 · 09

Series I — "Echo" — first cast

The first hand-poured silicone body comes out of the casting bay; the lead sculptor signs the underside.

2023 · 04

Wave 01 ships

Forty Series I units are built and shipped; thirty-eight are picked up by atelier technicians, in person, in twelve cities.

2024 · 07

Aria-7 is trained

The dialogue model retires Aria-3 — and a year of pre-training data — for a smaller, licensed corpus.

2025 · 02

Series II — "Ember" — enters production

Eight thermal zones; the first hand-tinted units leave the floor. The atelier passes 100 staff.

2025 · 11

Aria-7 paper is published

The model card and evaluation appear on arXiv; the studio quietly dedicates the paper to a former cellist on staff.

2026 · 05

Wave 04 opens

Reservations for spring 2026 delivery. We are here.

2026 · Q4

Series III — "Aria" — production

The flagship embodied series enters production. Lots of forty, made in Tokyo.

Careers · Tokyo & remote

Open positions, on the floor.

We hire slowly and we listen carefully. If you write us, we will read it. If you apply for a role we do not have, we will probably read that too.

Voice studio
Tokyo · Full-time

Senior phonologist

Help calibrate the next two voices. Strong background in prosody, pause structure, and dialogue annotation.

Apply
Sculpting bay
Tokyo · Full-time

Silicone tinting lead

Lead the tinting team. Five years of pigment chemistry or fine-art conservation experience.

Apply
Sensor lab
Tokyo · Full-time

Capacitive systems engineer

Sub-millimetre capacitive sensing in soft-tissue forms. PhD or equivalent industrial work; embedded firmware comfort.

Apply
Research
Tokyo or Remote · EU OK

Privacy engineer

Maintain the on-device runtime, the deletion pipeline, and the audit interface. Reports to Aren.

Apply
Listening room
Tokyo · Part-time OK

Owner relations · bilingual

Run fittings and demos. Native-level Japanese and English; warmth and discretion the actual job description.

Apply

We sponsor visas for Japan. We do not advertise on job boards — these are the only listings.

Locations

One floor in Tokyo, three small partners abroad.

The atelier is in Tokyo. Service partners in Berlin, Paris and São Paulo handle yearly servicing for owners in those regions.

HQ · Atelier

Tokyo

4F, 12-3 Sakuragaoka-chō
Shibuya-ku, Tokyo 150-0031
Japan

128 staff · By appointment
Service partner

Berlin

Atelier ZWEI · Mitte
Linienstraße 132
Germany

EU service · By appointment
Service partner

Paris

Atelier Saint-Honoré
21 Rue de Castiglione
France

EU service · By appointment
Press & recognition

A small list, deliberately.

What Bit7 actually sells, behind the velvet, is dignity around a subject that has not had much.
Le Quotidien du Design · 2025
Profile
The Bit7 atelier reads more like a small Japanese studio for hi-fi audio than a tech company.
ARTICLE Magazine · 2026
Cover feature
Aria-7 is the first conversational model I've used that knows when not to say anything.
WIRED · 2026
Review
The ethics charter is the most coherent document of its kind I have read out of any AI company this decade.
FT Weekend · 2025
Op-ed

Visit the atelier.

The listening room books two weeks ahead. Come for an hour. We'll make you a coffee.