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Diving into the sea forest

JP / EN ONLINE STORE

When the sea changes, the world changes.

Nature positive, beginning in the sea of Karatsu, Japan.

When the sea comes back, so do we.

SCROLL

Statement — Blue is the color of life

Blue is the color of life.

The blue we see in the sea is a color woven by countless lives —
fish, seaweed, and microbes invisible to the eye.
For generations, the richness of this sea has sustained the way we live.

We are people who live with the sea, gathered around one fisherman.
Starting from the sea's recovery, we restore lost ecosystems, nurture culture,
and bring prosperity back to this region.

Once more, a rich sea connecting this region to the world.
Carrying the blue of life into the future.

Why — The Problem & The Proof

An “ocean desert”
can become a forest again.

BEFORE

Isoyake — a seabed stripped of seaweed, bare rock exposed

SCROLL TO REVIVE

The Value — Why Seagrass Beds Matter

Seaweed beds are the cradle of the sea.

A thriving seaweed bed is far more than a patch of seaweed. It nurtures countless creatures, balances water and air, and sustains our food and daily life. These underwater forests are the very foundation of the marine ecosystem.

ROLE 01

Nurturing life Nursery

Seaweed forests are where fish and shellfish spawn, and where juveniles hide and grow. Lose the beds, and the cycle of life itself is broken.

ROLE 02

Balancing sea and sky Blue Carbon

Through photosynthesis, seaweed absorbs CO₂ and releases oxygen into the water. The carbon these beds store — “blue carbon” — also serves climate action.

ROLE 03

Sustaining our lives Livelihood

Rich seaweed beds mean rich fishing grounds. The sea's bounty carries local food, livelihoods, and coastal culture on to the next generation.

The Problem — A Changing Sea

From the seas of Japan,
fish and seaweed are disappearing.

“Isoyake” — seaweed vanishing to leave bare rock — is spreading along coastlines nationwide.
As the foundation of the marine ecosystem erodes, the impact quietly reaches our daily lives.

Japan's fisheries & aquaculture — production volume and value Peak (1980s) → 2023 …⟶ 2030 (projected)

Volume (10,000 t) Value (trillion yen) 2030 projected

0%Volume
12.82M → 3.72M t 0%Value
¥2.98T → ¥1.69T

Source: Fisheries Agency of Japan, Marine Fishery Production Statistics / Fishery Output (e-Stat); Fisheries White Paper. The 2030 figure is a projection extrapolated from past trends — not an official forecast. Interim years plot selected data points.

日本の磯焼け分布図 — 北海道から九州まで全国の沿岸で発生 — Isoyake across Japan Coastal burn-off in Japan

Learn about the problem →

What we do — 4 Actions

Four actions to revive the sea.

Results — Proof

The recovery, in numbers.

0ha

Seaweed beds restored
(≈ 30 acres)

0t-CO₂

J Blue Credit — cumulative certified volume
(21.4 t-CO₂ in FY2025)

Grand Prize

FY2025 Climate Change Action
Minister of the Environment Award

30by30

Certified Nature Coexistence Site (30by30)
(2025)

See results & certifications →

Partnership — For Companies & Governments

Turning ocean recovery
into corporate value.

Nature finance for the TNFD era — grounded in a real field site.
Fisher-led: measurable, and built to last.

Talk to us about partnership →

Story — 25 Years

“For every bit of care we give,
the sea gives back in kind.」

Shozo Kesamaru
Founder / Sea urchin fisherman / Seaweed bed restorer

Facing a sea turning white with isoyake, he began restoring the seaweed beds alone. Over 25 years, the forest has returned along 2.5 km of the Kushiura coast. Today, the work is carried forward with the local community, government, companies, and researchers.

Read the 25-year story →

Product — Sea to Table