Earth Regeneration & Place Design Studio · Since 2024

Designing
Living Systems
for a Regenerative
Future

生命力をつちかう
学びと場を設計する

Soil. Fermentation. Architecture. Community.
We create ecosystems where life can return, grow, and connect.

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Soil Regeneration ◆ Fermentation Systems ◆ Wild Gastronomy ◆ Earth Architecture ◆ Circular Bio-Systems ◆ 土の再生 ◆ 発酵システム ◆ ワイルドガストロノミー ◆ 土建築 ◆ 循環型生体系 ◆ Soil Regeneration ◆ Fermentation Systems ◆ Wild Gastronomy ◆ Earth Architecture ◆ Circular Bio-Systems ◆ 土の再生 ◆ 発酵システム ◆ ワイルドガストロノミー ◆ 土建築 ◆ 循環型生体系 ◆

Core Members · 8

People & Land — Connected

8 practitioners. 8 disciplines. One living network — co-creating like fermentation, from the inside out.

齋藤 由佳子
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Co-Representative
齋藤 由佳子
Yukako Saito
Gastronomy × Regenerative soil eco-systems
遠野 未来
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Co-Representative
遠野 未来
Mirai Tono
Earth Architecture × Environmental Design
田中 悠香織
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田中 悠香織
Yukari Tanaka
Community & Resource Circulation
梅原 裕子
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梅原 裕子
Yuko Umehara
Inner Branding & Beauty
北川 悌也
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北川 悌也
Yoshiya Kitagawa
Water Regeneration Engineering
広瀬 朋子
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広瀬 朋子
Tomoko Hirose
Holistic Well-being Design
村上 茉鈴
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村上 茉鈴
Marin Murakami
Community Design / Visual Art
岡崎 啓子
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岡崎 啓子
Keiko Okazaki
Agri-tourism / International Collaboration

JIEN is not an "organisation" —
it is a living network where different specialisms relate loosely, co-creating like fermentation, from the inside out.

Our Solution

ソリューション

Bio-Technology &
Circular Material Integration

Toiletowa — Living Sanitation Structure
Living Sanitation System

A next-generation bio-toilet powered by composite fermentation technology. Toiletowa transforms human waste into safe water systems, agricultural nutrients, and regenerative ecosystem inputs — closing the loop between human life and living soil.

🚽
Waste Input
🦠
Fermentation
🌱
Soil Nutrient
Odorless Zero-Pollution Global Scale Education Ecosystem

Fermentation Science

Harnessing microbial communities to process organic matter safely and efficiently. Not controlling — tuning environments where natural processes flourish.

Microbial Ecosystem Design

Engineering biological systems that convert waste streams into valuable agricultural inputs, closing material loops across the built and natural environment.

Architecture Integration

Bio-sanitation embedded within earth-built structures. Toiletowa systems are designed to integrate seamlessly with JIEN's regenerative architecture projects globally.

Global Scalability

From Shizuoka to Nigeria, the Toiletowa ecosystem includes training, education, and community building to ensure systems are adopted and maintained locally.

About JIEN

A living network
of regenerators

JIEN LLP is an experimental collective working at the intersection of soil regeneration, fermentation systems, architecture, and community design. Founded in Japan, we bring together individuals across disciplines, cultures, and geographies to co-create new forms of living systems.

Connecting activists who carry the regeneration of soil, agriculture, water, community, beauty, forest, management, and wellbeing — we create place-based ecosystems where lives support one another.

"We do not build systems.
We prepare conditions
where life can happen."
8+
Core Members
3+
Active Projects
150+
Community Members
2
Regions · JP

Our Philosophy / 哲学

From Control to Coherence

01

Alignment
over Force

Modern systems attempt to dominate nature. We work with it — designing flows that align with ecological rhythms rather than fighting against them.

02

Flow over
Fragmentation

Waste is only waste when it leaves a system. We design circular pathways where every output becomes an input — soil to food to shelter and back.

03

Regeneration
over Extraction

Small interventions — like seeds — create ripple effects across ecosystems. We plant the conditions for abundance, not the illusion of control.

Our Projects

Where theory
meets terrain

静岡ワイルド・ガストロノミー協議会 — 富士山と川と海の風景
Gastronomy · Ecology
Project 01 / Shizuoka

Shizuoka Wild
Gastronomy Council

そこにしかない自然がつくる食と風景

A regional initiative reimagining gastronomy through the lens of wild ecosystems. From the mountain ranges to the coast, the project reconnects local biodiversity, cultural food knowledge, and community identity. Food rooted in native ecosystems and living biomes — the wisdom of the mountains and valleys for the future.

Wild Biodiversity Gastronomy Tourism Cultural Identity Shizuoka
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