At CEDEC 2026 today (the 23rd), Cygames held a session on integrating AI into scenario writing, presented by engineer Hiroshi Tatefuku, who joined Cygames in 2018 and has identified AI's potential since late 2019. Tatefuku recalled that a project team requested AI support for scenario writing because the game had been running for a long time, the number of characters had grown, and the details scenario writers needed to track had increased significantly, placing a heavy burden on writers. Cygames uses its proprietary scenario writing tool, 'Goehon,' across almost all projects and has been using 'Dify' for prototype development and operations. Tatefuku outlined five major tasks: a tool to check for contradictions between scenarios and character settings; techniques to ensure AI accurately identifies specific requirements; a tool to assist in writing dialogue for characters with unique speech patterns; a dialect review tool; and a typo detection tool. The reason for the contradiction-checking tool was that the number of items to check had grown exponentially, making it difficult for human staff to handle quickly. His team designed a system where a scenario writer can input a scenario ID into the writing tool to immediately check for contradictions between the character settings.