During June 2025, Nagase focused on improving the clarity and maintainability of the geolonia/handbook.geolonia.com repository by refining its documentation. He addressed a specific issue in the recommend-plugin.md file, removing duplicated sections and redundant content related to Google Chrome extension installation and plugin recommendations. Using Markdown and applying disciplined documentation practices, Nagase committed a targeted patch that streamlined the handbook’s guidance for developers integrating plugins. This work enhanced onboarding clarity and reduced confusion for new users. While the scope was limited to a single documentation bug fix, the update demonstrated careful attention to detail and traceable, repository-based change management.