SecureNavi Inc. (Headquarters: Minato-ku, Tokyo; CEO: Tomohiro Izaki) is pleased to announce the release of the "Subcontractor Relationship Diagram / Impact Scope Analysis Function" for its security risk assessment cloud service, "2Sen no Takumi Cloud," designed for second-line departments (responsible for security, risk management, and compliance). This new feature visualizes the subcontracting structure of Nth-tier subcontractors and enables real-time identification of the impact scope during incidents. This function allows users to grasp at a glance the complex subcontracting structure, including not only primary subcontractors but also secondary and tertiary subcontractors (Nth-tier subcontractors), presented in a hierarchical tree format. Furthermore, in the event of an incident, simply selecting the originating company instantly visualizes the affected managed items and subcontracting routes, supporting rapid response. Background and Challenges In subcontractor management, understanding the entire subcontracting structure, including Nth-tier subcontractors (secondary and tertiary subcontractors) beyond directly contracted primary subcontractors, is a critical challenge for risk management. Such threats are recognized across the industry, with "Attacks Targeting Supply Chains and Subcontractors" ranking 8th for the 8th consecutive year in IPA's Top 10 Information Security Threats 2026. Traditionally, there have been limited means to visualize the overall subcontracting structure, often relying on manual management based on ledgers. Additionally, when a security incident occurs with a tertiary subcontractor or beyond, it has been difficult to quickly ascertain which of the company's managed items or operations would be affected, leading to delays in initial response. 2Sen no Takumi Cloud was developed to address these challenges. Overview of the New "Subcontractor Relationship Diagram / Impact Scope Analysis Function" The newly released function consists of two