BLHXFY is a userscript (Tampermonkey/Violentmonkey) that provides Chinese translation for the Japanese web game Granblue Fantasy (็ขง่ๅนปๆณ). It intercepts XMLHttpRequests from the game client, replaces Japanese/English text with Chinese translations from CSV files, and modifies the DOM for UI elements. The translation covers scenarios, battle skills, NPC names, chat presets, buffs, and more. It includes a settings panel, support for AI translation via OpenAI-compatible APIs, and tools for translators to download CSV files. The codebase is modular, using ES6 modules and Rollup for bundling. It is actively maintained with CI/CD pipelines and a dedicated data repository for translation files. The architecture is specific to Granblue Fantasy's internal data structures, making most components non-reusable outside this context, but the overall craftsmanship is solid.