What DI System does

DI System (株式会社ディ・アイ・システム, D.I. System Co., Ltd.) is a Tokyo-headquartered Japanese system integrator founded in November 1997 and listed on the TSE Standard Market (ticker: 4421). The company operates across three primary business lines — system development (Java, .NET), network and cloud infrastructure design/construction, and security/IT education — with 766 consolidated employees as of April 2026 and eight offices spanning Tokyo, Osaka, Nagoya, Fukuoka, Yokohama, Shizuoka, and Yamaguchi.

The technology portfolio combines proprietary products with third-party platform resale. Proprietary assets include the Cornelius-LMS / Cornelius-LMS+ e-learning platforms (ID-free cloud LMS for compliance and certification training), WEEDS Trace privileged ID management solution (developed by wholly-owned subsidiary WEEDS SYSTEMS, acquired July 2022), the Syslog Watcher Appliance "Tamelog" (pre-configured log management), SMART ZIRA paperless tablet solution, and the newer PJT Freshman AI-enhanced engineer training platform. Resale and implementation partnerships cover Cisco Meraki/Webex, VMware virtualization, HPE storage, Trend Micro security, Box cloud content management, Rakuraku Framework 3 / Workflow II low-code platforms, Web Performer, and SKYSEA Client View. The company holds ISO/IEC 27001:2022, ISO 9001:2015, and Privacy Mark (JIS Q 15001) certifications.

DI System generates revenue primarily through professional services (custom software development, infrastructure construction, security implementation, training) supplemented by recurring/subscription revenue from software products (Cornelius-LMS Plus from ¥0 to ¥150,000/month, Tamelog from ¥450,000 initial plus ¥180,000/year maintenance, WEEDS Trace per-license). The customer base spans large enterprises (a major trading company, Seibu Holdings, Hanamaru, Diamond Communications), mid-market firms, SMBs, and educational institutions across automotive, publishing, food service, insurance, education, healthcare, railway, and IT sectors. GTM is hybrid: direct enterprise field sales from eight regional offices, ICT sales outsourcing with personnel stationed at customer sites, and channel partners (Cisco Premier, VMware Professional, HP).

Name

DI System

Legal name

株式会社ディ・アイ・システム

Website

https://di-system.co.jp

Company type

Public

Founded year

1997

Operating status

Operating

Headcount range

501–1,000 employees

Short description

DI System is a Tokyo-based Japanese IT services company (TSE Standard: 4421) providing system development, network infrastructure, security solutions, and IT education to enterprise and mid-market clients across Japan through eight offices and 766 employees.

Ownership category

akta.pro rank

Product category

IT System Integration and Enterprise Software

NAICS

Computer Systems Design and Related Services (54151), Computer Systems Design Services (541512), Custom Computer Programming Services (541511), Computer Facilities Management Services (541513)

SIC

Services-Computer Integrated Systems Design (7373), Services-Prepackaged Software (7372), Services-Computer Programming Services (7371), Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

ITSM Platform Implementation & Administration (ServiceNow/JSM/BMC/etc.) (BPAEAJAC)

akta.pro secondary industries

Enterprise Applications User/Admin Training (ERP/CRM/ITSM platforms) (BPAEANAK), IT Asset Lifecycle Services (Procure-to-Retire) (BPAEAOAF), Managed IT Services & On‑Site Field Support (Helpdesk, Break/Fix, IMAC) (EDAEAHAJ)

Keywords

• IT system integration
• Enterprise security solutions
• E-learning platforms
• IT infrastructure services
• IT training services

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Software Design/Development/Operations: Custom software development services using Java, .NET and other open-source technologies for business applications including HR, sales management, procurement, and workflow systems.
2. IT Infrastructure Design/Construction/Operations: Network infrastructure services including cloud foundation, storage, Active Directory, WSUS, and KMS solutions for enterprise environments.
3. Education Services: IT training and certification preparation courses including new graduate training, customized training, cloud training, and information security training.
4. Security Product Sales: Security product development and sales including Cornelius-LMS, Cornelius-LMS Plus, WEEDS Trace, Tamelog syslog appliance, and related security solutions.
5. Security Solution Implementation Support: Consulting and implementation services for security solutions including ISMS compliance, privileged ID management, and comprehensive security architecture.
6. Sales/Business Process Outsourcing: ICT sales and business process outsourcing services providing skilled sales personnel stationed at customer sites to support sales activities.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels7 records

Core offering

DI System is a Japanese system integrator providing enterprise IT solutions across three pillars: (1) System Development and IT Infrastructure design, construction, and operations using Java/.NET and cloud technologies; (2) Proprietary and third-party security products including the Cornelius e-learning platform family, WEEDS Trace privileged ID management, and Tamelog syslog appliance; (3) IT education services including AI-enhanced new graduate training, generative AI courses, and certification preparation. The company also delivers Box cloud content management, Cisco Meraki/Webex, and Rakuraku low-code platforms with implementation and operational support.

Product overview

DI System (株式会社ディ・アイ・システム, D.I. System) is a Japanese system integrator offering a portfolio of proprietary and third-party products, cloud-based platforms, and managed services. Its core product lines include Cornelius-LMS / Cornelius-LMS+ (ID-free e-learning management systems), WEEDS Trace (privileged ID management, developed by group subsidiary WEEDS SYSTEMS), and Syslog Watcher Appliance「ためログ」(pre-configured log management appliance). The company also delivers Box cloud content management implementation and migration, Cisco Meraki/Wi-Fi, and Cisco Webex. Its service portfolio spans system development (Java/.NET), infrastructure and security solutions (network, cloud, Active Directory, WSUS, KMS), and IT training (AI-enhanced new employee programs, generative AI courses, and professional certification training). Rakuraku Framework 3 and Rakuraku Workflow II are offered as low-code development tools, while IT asset management is addressed through SKYSEA Client View, Ekran, and targeted email training services. The company holds ISO 27001, ISO 9001, and Privacy Mark certifications and serves major Japanese enterprises across financial, logistics, publishing, and manufacturing sectors.

Differentiator

Problem solved

Functional benefit

Brands

• Cornelius-LMS: ID-free e-learning management system for corporate training, suitable for security, compliance, and harassment training with large workforces.
• Cornelius-LMS+
• Cornelius STRESS CHECK SYSTEM
• PJT Freshman
• ためログ
• WEEDS Trace
• SOCOCARA AUTO MARKET
• 楽々Framework3 / 楽々WorkflowII
• Cornelius EDR

Products and services

• Cornelius-LMS (E-learning Management System) ID-free cloud-based e-learning management system optimized for large-scale mandatory training such as security awareness, compliance, and harassment prevention. Features test and survey functionality, CSV-based reporting, and simultaneous enrollment capacity of 50-200 users.
• Cornelius-LMS Plus Cloud-based LMS for targeted training (professional skills, certification, and specialized courses) with drag-and-drop course creation, video upload, automated learner management, and progress tracking. Includes 7 plan tiers from entry (free) to large-scale concurrent login options.
• WEEDS Trace (Privileged ID Management Solution) Privileged ID management and monitoring solution developed by WEEDS SYSTEMS (DI System Group subsidiary). Provides integrated management of privileged accounts, access control, and audit functions for compliance with SOX, FISC, PCI DSS, and ISMS standards. Includes workflow-based application and approval, automated password issuance, and comprehensive access logging.
• Syslog Watcher Appliance "Tamelog" (ためログ)

Quantifiable outcome

• Reduced hardware costs and space/power savings through server consolidation
• +7 more outcomes

Named customers16 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

AI capability9 records

Feature5 records

Partnerships

13 partnerships are on record, tiered core and standard.

• 住友電工情報システム株式会社coreTechnology or IntegrationDevelopment and sales partner for Rakuraku Framework 3 and Rakuraku Workflow II rapid application development platforms. DI System provides implementation and operational support services for these products.
• シスコシステムズ合同会社coreTechnology or IntegrationPremier Certified Partner for Cisco products including Meraki wireless LAN solutions, Webex collaboration tools, and network infrastructure equipment.
• ヴイエムウェア株式会社coreTechnology or IntegrationProfessional Solution Provider for VMware virtualization and cloud infrastructure solutions.
• 日本ヒューレット・パッカード株式会社coreTechnology or IntegrationSales partner for HPE/HP storage, servers, and network equipment solutions. Recommended storage vendor.
• トレンドマイクロ株式会社standardTechnology or IntegrationBusiness partner for Trend Micro security solutions including endpoint protection and network security products.
• キヤノンITソリューションズ株式会社coreTechnology or IntegrationSales and SI partner for Web Performer rapid application development tool.
• Business Partners (Enterprises and Individual Contractors)standardChannel Partner/ Reseller/ DistributorCompanies and individuals collaborating to provide better services through mutual growth and complementary expertise.
• WEEDS SYSTEMS (ウイーズ・システムズ株式会社)coreStrategic or Co-development PartnerGroup company developing WEEDS Trace privileged ID management solution. WEEDS SYSTEMS is a security specialist company focused on access logging since founding.
• アスリーブレインズ株式会社coreStrategic or Co-development Partner100% owned subsidiary providing engineer training services. Operates the training course registration website (a3-brains.co.jp).
• 株式会社ステップコムstandardStrategic or Co-development Partner100% owned subsidiary integrated into group operations.
• 株式会社エム・アイ・シーstandardStrategic or Co-development Partner100% owned subsidiary integrated into group operations since January 2026.
• 株式会社クエストコンサルティングstandardStrategic or Co-development PartnerSubsidiary of A3 Brains (100% owned by DI System group) since May 2026.
• ジュピターテクノロジー株式会社coreTechnology or IntegrationDistributor of Syslog Watcher V6 Professional software used in Tamelog appliance. Also distributes Ekran screen recording software.

Scale indicators4 records

Recent moves12 records

Expansion highlights4 records

Direct peers

• TIS Inc. Independent Japanese SI offering custom system development, IT outsourcing, and solution services to financial, manufacturing, and public-sector clients. Comparable in scale, SI services profile, and Japanese enterprise customer focus.
• Canon IT Solutions: Subsidiary of Canon that sells Web Performer low-code platform — directly comparable as a partner-resell relationship and as a Japanese IT services competitor offering similar application development and SI services to enterprise clients.
• Internet Initiative Japan (IIJ): Japanese IT services company providing network infrastructure, cloud, security, and managed services. Overlaps with DI System's IT infrastructure, security, and managed services lines and competes for similar enterprise customers.
• BIPROGY: Mid-sized Japanese system integrator (formerly UNISYS Japan) offering custom system development, IT services, and solutions across financial, public sector, and manufacturing customers. Closely comparable in size, customer mix, and SI services profile to DI System.
• SCSK Corporation: Sumitomo Group-affiliated Japanese SI providing system development, IT infrastructure, and BPO. Comparable mid-cap SI profile with similar partnership-based delivery and enterprise customer base.
• DTS Corporation: Mid-sized Japanese SI focused on system development, embedded solutions, and IT services for financial, manufacturing, and telecom customers. Closely comparable size and custom-development-heavy business model.
• Otsuka Corporation: Japanese system integrator and Microsoft/Cisco-focused reseller serving SMB and mid-market with similar multi-vendor IT services and packaged software distribution. Comparable business model combining hardware/software resale with SI services.
• NS Solutions Corporation: Nippon Steel Group-affiliated Japanese SI providing system development, IT infrastructure, and consulting to manufacturing and financial enterprises. Comparable mid-cap SI profile with similar services mix.

Broad incumbents

• Nomura Research Institute (NRI): One of Japan's largest SI and consulting firms serving financial, industrial, and public-sector clients. Broader and larger incumbent with overlapping system development and IT services offerings.
• Itochu Techno-Solutions (CTC): Large Japanese SI and IT solutions provider within the Itochu Group, offering enterprise IT services, cloud, and networking. Larger-scale incumbent with broader portfolio but overlapping enterprise infrastructure and Cisco partnership delivery.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries5 records

Funding overview

Funding rounds1 record

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 DI System