The Infrastructure Hub — Osaka, Minami-Semba

Connecting contractors
with the right project.

Construction, civil engineering, and facilities procurement —
plus strategic battery storage land matching.
We don't self-perform. That's how we stay unbiased and find the single best fit.

2018Founded
8Business Areas
NationwideCoverage
OsakaHeadquarters
The Infrastructure Hub

Construction / Civil / Facilities

Optimal matching, from here.

Electrical, civil engineering, facilities, and battery storage land acquisition.
We don't perform the work ourselves. That's precisely why we can recommend — free from obligation — the single most capable contractor for any given project.

Our Identity

What we connect is
the finest expertise with
the right project.

Building any piece of infrastructure requires multiple specializations: electrical, mechanical, plumbing, civil engineering, site grading, and demolition. Placing orders separately multiplies contact points, makes estimates hard to compare, and blurs accountability.

We consolidate those fragmented orders into one — bringing in the right professional at the right time. Acting as the command center that connects skilled contractors with the projects that need them. That is our role.

Business Structure
Our matching has2core flows

Our matching business runs in two distinct directions.

BUSINESS A

Construction, Civil & Facilities
Consolidated Procurement

From demolition and site grading to electrical, HVAC, plumbing, and sanitation — we decode complex overlapping processes and coordinate the right specialist contractors with precision. One point of contact handles competitive bidding and scheduling. You decide what you need; we do the connecting.

For You
  • Can't find a contractor you can trust
  • Want to consolidate multiple trades into one order
  • Looking to reduce the burden of schedule coordination
BUSINESS B

Battery Storage Land
Strategic Acquisition & Matching

Grid-scale battery storage sites are the backbone of next-generation energy infrastructure. We transform underutilized land into a stable, long-term asset — strategically connecting landowners, project developers, and contractors to power tomorrow's grid.

For You
  • Holding idle farmland, forest, or fallow fields
  • Burdened by mowing and ongoing maintenance costs
  • Inherited land with no clear plan
For Landowners

Is your land
"sitting idle"
right now?

"Farmland or forest I have no use for." "The mowing every year is exhausting." "I inherited it but have no idea what to do." — land like that can become the foundation for next-generation energy infrastructure. Grid-scale battery storage, which stores surplus renewable energy and delivers a stable supply, is rapidly expanding as critical new infrastructure.

01
Long-term, stable incomeSale or lease — both options available. Turn idle land into a reliable revenue source.
02
Free from management burdenNo more mowing or ongoing maintenance headaches.
03
As-is condition is fineOvergrown, items remaining, old structures — just contact us first.
Land Conditions
Area300 tsubo (approx. 990 m²) or more
LocationHigh-voltage line within 1 km / at least approx. 100 m from residential buildings
Road AccessAdjacent to a road 5 m or wider for equipment delivery
TerrainFlat or gradeable (steep slopes excluded)
ExclusionsFlood, landslide, liquefaction, or severe salt-damage zones not eligible
Agricultural LandFarmland is not directly eligible; land reclassification is a prerequisite. Please consult us first.
* Land conditions are guidelines. Actual eligibility is determined case by case.
Referral Partners

"Can't sell.""Can't use."
Give that land a way out.

In inheritance consultations, property sales, and demolition or grading projects, do you sometimes encounter farmland, forest, or idle land that no one knows what to do with? ROCK STAR JAPAN is looking for referral partners who can bring us those land leads. We evaluate each property for suitability as a battery storage site and handle everything from assessment to utilization — all in one place.

Tax / CPA / Administrative lawyers Financial institutions — Wealth & Estate divisions Real estate agencies Demolition & grading contractors Land surveyors
Referral fees paid upon successful contract. Strict confidentiality · Fast response
Matching Archive

Matching Results & Case Studies

01

Electrical & Power Systems for New Apartment Construction

Matched electrical and power equipment contractors for a new build. Balanced quality and cost through competitive tendering.

02

Renovation & Site Grading Coordination for a Resort Property

Coordinated multiple specialists for one-stop procurement — from demolition and grading through to interior finishing and plumbing.

03

Consolidated Infrastructure for a Restaurant (Electrical, HVAC, Ventilation, Plumbing)

Single-order procurement covering electrical, HVAC, ventilation, and sanitation works.

04

Full-Package Coordination for a 3-Story RC Apartment

End-to-end specialist matching — from structural work through to finishing trades.

05

Grading Contractor Matching for Sloped Land

Identified and engaged a grading contractor capable of handling significant grade change on a challenging site.

Our Business
RSJ-01

Apparel

Built around the eyewear brand "Grantless," we develop and manage our own original product lines.

APPAREL
RSJ-02

Drone

Aerial photo and video production, delivering visually striking perspectives unique to drone footage.

DRONE
RSJ-03

Video

Motion graphics that bring still images to life — expanding your promotional toolkit with high-impact video production.

VIDEO
RSJ-04

Design

From brochures and catalogs to logo creation — design work that gives your brand's world a tangible form.

DESIGN
RSJ-05

Web

End-to-end website production and management — from strategy and implementation through to ongoing maintenance.

WEB
RSJ-06

Advertising

Handling a wide range of media, centered on TV and radio commercials.

AD
RSJ-07

Events

Planning and production for live events, soccer, futsal, and other sports events.

EVENT
RSJ-08

Media

Operating "EeNa," an information site highlighting the people, things, and moments worth noticing.

MEDIA
Company
CompanyROCK STAR JAPAN Co., Ltd.
ロックスタージャパン株式会社
AddressMinami-Semba 3-7-29 5F, Chuo-ku, Osaka City, Osaka, Japan
Tel06-4708-7321
CEOTakashi Kakutani
SinceJuly 2018
Capital¥10,000,000
Contact

Let us make
the connection.

Construction inquiries or land utilization questions — reach out anytime.

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