Idiom

What Idiom does

株式会社idiom (Idiom Inc.) is a Tokyo-based creative office established in 2015 that provides end-to-end e-commerce (EC) site construction, operations outsourcing, back-office fulfillment, and consulting services to Japanese small and mid-market businesses. The company's core offering is a fully-outsourced EC operations service covering storefront construction, marketing and advertising, order processing, packing, shipping, and customer support, delivered across all major Japanese EC malls (Rakuten, Yahoo! Shopping, Amazon Japan), ASP carts (Shopify, ecforce, Shopserve, ColorMe Shop, STORES, BASE), and open-source platforms. Idiom differentiates through a performance-based pricing model that charges 5-20% of client sales revenue, eliminating client financial risk while aligning vendor incentives.

The business operates five service lines: full EC operations outsourcing (performance-based or fixed monthly from ¥50,000), EC site construction (one-time fees from ¥100,000 for basic ASP builds to ¥2,000,000 for full-scratch custom builds), back-office and fulfillment outsourcing (¥30/order or ¥100/pack, or 10%+ of sales), EC consulting (from ¥15,000/month), and cross-border EC support staffed by native English-speaking personnel. The company has completed 100+ construction projects and served 120+ client companies with a reported 94-95% client continuity rate. Notable client outcomes include stores achieving ¥100M+/month in sales and one client growing from ¥10M/month to ¥100M/month within one year of Idiom's engagement.

Idiom maintains certified partner status with ecforce Partners (March 2023), ColorMe Shop (April 2020), Shopify, Shopserve, STORES, and BASE, generating referral leads from each platform ecosystem. The company also holds METI IT Introduction Support Provider (IT導入支援事業者) certification, enabling it to facilitate government IT subsidies for SMB clients. Distribution is primarily through inbound direct sales (website forms and phone), supplemented by content marketing via the EC Column blog and earned media features in Japanese web media outlets. The company is privately held by founder/CEO Kei Izumi (出水 慶), headquartered in Itabashi-ku, Tokyo, with no disclosed external funding or parent company.

Name

Idiom

Legal name

株式会社idiom

Website

https://idiom-inc.co.jp

Company type

Private

Founded year

2015

Operating status

Operating

Short description

株式会社idiom (Idiom Inc.) is a Tokyo-based EC outsourcing firm founded in 2015 that provides end-to-end e-commerce site construction, operations management, fulfillment, and consulting services to Japanese SMB and mid-market companies under performance-based and fixed-fee pricing models.

Ownership category

akta.pro rank

Headquarters

HQ city

Itabashi

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. EC Operations Outsourcing (Performance-Based): Idiom charges a percentage of monthly sales revenue as commission for full EC operations outsourcing. The fee percentage varies by service scope and sales volume (e.g., 5% base rate, up to 20% for full fulfillment). No upfront costs; revenue is earned only when clients generate sales.
2. EC Operations Outsourcing (Fixed Monthly): Fixed monthly fee plans starting from ¥50,000/month for customized service packages including marketing consultation, production support, and operational efficiency advisory. This provides predictable recurring revenue.
3. EC Site Construction: One-time project fees for building EC sites on various platforms. Pricing ranges from ¥100,000 for basic ASP builds to ¥2,000,000 for full-scratch custom builds, depending on product count, site complexity, and build method.
4. Back-Office & Fulfillment Services: Per-transaction and per-packaging fees for order processing, customer inquiry handling, packing, and shipping. Fixed monthly plans (from ¥150,000/month) or performance-based (10% of sales) also available.
5. EC Consulting: Monthly consulting retainer from ¥15,000/month or performance-based compensation, covering analysis, strategy, advertising, and site optimization.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels5 records

Core offering

Idiom provides end-to-end e-commerce operations outsourcing for Japanese SMB and mid-market companies, handling every aspect of EC store operations from site construction and marketing through order processing, fulfillment, packing, shipping, and customer support. Its flagship offering is a full-fulfillment, performance-based service (5–20% of client monthly sales) that allows clients to outsource the entire EC function under a single partner, supported by complementary site construction, consulting, back-office, and cross-border EC services.

Product overview

Idiom（株式会社idiom）はECサイト構築・運営代行を主力とする総合サービス企業で、5つのコアサービスを展開しています。主力サービス「EC運営代行サービス（総合支援）」は完全成果報酬型でショップ構築〜販促〜受注処理〜梱包発送までの全業務を委託可能で、これと並行して「ECサイト制作・構築」「ECコンサルティング」「バックオフィス・配送運営代行」「WEB/DTP/動画制作」「越境EC支援サービス」の各モジュールを提供しています。料金体系は成果報酬型（売上5%〜）、固定月額型（月5万円〜）、従量課金型（注文30円〜）から選択でき、Shopify・ecforce・楽天市場・Yahoo! Shopping・Amazon等の複数のECカート・モールに対応しています。

Differentiator

Problem solved

Functional benefit

Brands

• EC運営代行サービス: Full-service EC operation outsourcing with performance-based compensation model
• EC制作・構築
• バックオフィス・配送代行
• ECコンサルティング
• アスカラ

Quantifiable outcome

• 94–95% client retention rate over 10+ years of operations
• +4 more outcomes

Named customers3 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration18 records

Feature4 records

Partnerships

Five partnerships are on record, tiered core and minor.

• ecforce (株式会社SUPER STUDIO)coreTechnology or Integration · 20 March 2023Idiom received official ecforce Partners certification in March 2023, enabling the company to provide comprehensive EC/D2C business support in cooperation with ecforce consulting. ecforce provides an all-in-one EC system covering store setup, operations, and sales maximization. This partnership allows Idiom to offer integrated EC platform and operations services to clients.
• カラーミーショップ (ColorMe Shop / GMOペパボ)coreChannel Partner/ Reseller/ Distributor · 1 April 2020Idiom was certified as an authorized agency and production partner for ColorMe Shop, a major Japanese ASP cart service operated by GMO Pepabo. The partnership enables Idiom to recommend, build, and manage ColorMe Shop stores for clients, with access to preferential support and referral traffic from the ColorMe Shop platform.
• ShopserveminorChannel Partner/ Reseller/ DistributorIdiom holds Shopserve certified partner status, enabling it to build and operate EC sites on the Shopserve platform for clients.
• STORESminorChannel Partner/ Reseller/ DistributorIdiom holds STORES certified partner status, enabling it to build and manage stores on the STORES platform.
• BASEminorChannel Partner/ Reseller/ DistributorIdiom holds BASE certified partner status, enabling it to build and manage stores on the BASE platform.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Itsumo Inc. (株式会社いつも): Japan's largest dedicated EC operations outsourcing agency, providing full-service EC operations including store construction, marketing, fulfillment, and customer support to SMB and enterprise clients — directly comparable in service scope and target customer to Idiom.
• FLAG Inc. (株式会社フラッグ): EC strategy and operations agency serving Japanese D2C and retail brands, offering store operations, marketing, and fulfillment services. Direct peer in the Japanese EC outsourcing space with similar mid-market customer focus.
• Temona Inc. (株式会社テモナ): EC consulting and subscription-based EC support services provider targeting Japanese D2C and SMB brands. Offers EC strategy, operations outsourcing, and customer success services — overlapping significantly with Idiom's EC consulting and operations offerings.

Broad incumbents

• Transcosmos Inc. (トランスコスモス株式会社): Large publicly-listed BPO and digital services conglomerate offering EC operations, customer support, and digital marketing at scale. Broader portfolio including contact centers and global delivery — overlaps with Idiom but operates at much larger scale across multiple service lines.
• Dentsu Digital Inc. (株式会社電通デジタル): Large digital agency subsidiary of Dentsu Group providing EC consulting, marketing operations, and digital transformation services. Offers overlapping EC capabilities but as part of a much broader enterprise marketing services portfolio.
• Adways Inc. (株式会社アドウェイズ): Digital marketing company with EC support services, affiliate platform (JANet/A8.net), and cross-border EC offerings. Broader marketing-tech focus with EC as one vertical — adjacent competitor to Idiom in cross-border EC services.

Others

• BASE Inc. (BASE株式会社): Operates the BASE EC platform for SMB merchants; Idiom is a certified partner. Functions as an enabling platform/infrastructure provider rather than direct competitor, but platform-side services could compete over time.
• SUPER STUDIO (ecforce): Operates the ecforce EC platform ecosystem and is a strategic technology partner to Idiom. Partner relationship generates referral leads; potential future overlap if SUPER STUDIO expands into managed services.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Idiom