tiny_chat is an advanced chat application leveraging Large Language Models (LLMs) to facilitate interactive conversations with integrated Retrieval-Augmented Generation (RAG) technology. It supports database connectivity for storing and retrieving information, and includes MCP server capabilities for modular communication. Designed with a user interface optimized for Japanese users, it enables seamless, contextual, and intelligent chat interactions. The system can be installed from source or as a package, and can run in development or production environments. It is suitable for developers, organizations integrating AI chat features, and Japanese-speaking users needing a robust conversational platform.