Strategy wheregrowth happens.

A boutique marketing strategy firm based in Kawagoe, supporting businesses through customer creation and relationship design.

01 — Positioning

Rethinking the gaps,
starting with structure.

Three Plus Six LLC is a marketing strategy firm that addresses the structural gaps between clients and agencies, strategy and execution, brands and customers.

Drawing on 33 years of decision-making and frontline experience inside the advertising industry, we rethink, from an outside perspective, the kind of strategy businesses actually need.

02 — Services

Four ways we work
alongside you.

01
CARD Client-Agency Relationship Design

A specialized service that rethinks the relationship between clients and agencies, redesigning how agencies are selected, evaluated, and managed.

02
Strategy Sprint

An intensive engagement that structures business challenges and narrows down the next moves to make.

03
Advisory Retainer

Ongoing counsel at the leadership level, supporting decisions on marketing strategy, brand, and organization.

04
Open Platform Partnership

Deep, long-term co-creation with organizations in sports, regional development, and the social sector.

03 — Ecosystem

Three Plus Six Ecosystem

Three Plus Six is more than a company website: it is an ecosystem of connected channels, with a place to read observations, a place to try ideas out as small prototypes, a place for publishing and dialogue, and a place where consultation and implementation begin.

01
Three Plus Six

The company, services, and consultation path. We reframe complex issues in advertising, brand, marketing, organization, and community work as structures that help value reach customers.

02
Intelligence

Weekly analysis of changes in markets, customers, and brands, with implications for strategic decisions and questions to consider next. Published in Japanese.

03
Biotope

A small knowledge habitat for strategy, marketing, behavioral science, and field notes. It is in a quiet soft launch, with observations and essays added over time.

04
LAB

The experimental side of the ecosystem. LAB turns observations and hypotheses from Biotope into simulators, finders, and prototypes you can try out and discuss.

05
note / LinkedIn

Publishing and dialogue. note is where longer thinking unfolds in Japanese; LinkedIn is where practical conversations and professional context connect back to Three Plus Six.

Weekly shifts go to Intelligence.
Observations go to Biotope.
Experiments go to LAB.
Publishing and dialogue continue through note and LinkedIn.
Consultation and implementation happen at Three Plus Six.

04 — Partnership

Long-term value,
rooted in community.

Three Plus Six LLC × COEDO KAWAGOE F.C. 2026 Season Official Marketing Partner
Current Work

Nurturing the relationship between a community and a brand.

Three Plus Six LLC serves as the Official Marketing Partner of COEDO KAWAGOE F.C., a football club based in Kawagoe, Saitama, with ambitions to reach Japan's J.League. We are involved in brand building, fan engagement, and the design of relationships with the local community.

Rather than one-off campaigns, we invest in relationships over time. We bring the same approach to all our client work.

05 — Voice

Writing is where
dialogue begins.

Founder Hiroaki Mori publishes regularly on note, a popular Japanese publishing platform, covering marketing, branding, organizational thinking, and first principles. Articles are in Japanese. Company announcements also appear here.

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Three Plus Six
06 — About
Hiroaki Mori, Founder of Three Plus Six LLC
Founder Profile

Hiroaki Mori

Hakuhodo, TBWA\Chiat\Day Los Angeles, COO of TBWA\Hakuhodo\China in Guangzhou, CEO of McCann Erickson Tokyo, before going independent.

Hiroaki Mori

33 years on the inside. From here on, the outside.

Hiroaki Mori joined Hakuhodo in 1990, working across account management, marketing, brand consulting, and global project direction. After a posting at TBWA\Chiat\Day Los Angeles and serving as COO of TBWA\Hakuhodo\China in Guangzhou, he led McCann Erickson Tokyo as Representative Director and CEO for five years and nine months. He founded Three Plus Six LLC in June 2023.

Now based in Kawagoe, he works as an independent advisor, drawing on three decades of experience and relationships to design the strategy, meaning, and relationships businesses need to grow.

07 — Contact

Start by telling us
your story.

The initial consultation is complimentary. You do not need to have your situation fully mapped out. We will listen, help clarify the issues, and offer a candid recommendation on how we might be involved.

Send an inquiry Email us