Media4u Co., Ltd. (Minato-ku, Tokyo; President and CEO: Toru Iehata; hereinafter "Media4u"), a wholly owned subsidiary of Fabrica Holdings Co., Ltd., has announced a major update to its voice AI agent service "Aurora AI Call," introducing new functionality that simplifies the creation of prompts (instructions for AI) required to operate voice AI agents. Background of the Update: Recently, there has been growing interest in adopting AI for telephone response operations to improve efficiency and address labor shortages. However, many users face significant challenges when it comes to "writing effective prompts." Common issues include uncertainty about how to phrase instructions so the voice AI responds as desired, or finding that despite detailed configurations, response accuracy remains low, resulting in frequent call transfers back to human staff. Believing that "AI should not be a complex system, but rather something intuitive and accessible—like training a new human employee," Media4u developed this new feature to lower barriers to adoption. Key Update Features: With this update, there is no longer any need to write technical terminology or complex rule sets. Users can now create AI prompts simply by giving natural language instructions such as, "Create a prompt for appointment booking. If there's a question about allergies, transfer the call," or by uploading existing manuals—just as one might hand over documentation to a new employee. Even users unfamiliar with IT systems can set up AI quickly and begin using it as a reliable partner on the same day. ■ "Prompt Auto-Generation" via Natural Language Instructions By entering just a few lines of text, the AI interprets the user's intent, infers conditional logic and required questioning points, and automatically generates an optimized prompt. No expertise in prompt engineering is required. ■ "Document Upload" Support: Turn Existing Files into Working Prompts Users can upload existing documents such as response manua