国王陛下 (Kokuou Heika) manga refers to a specific manga title written in Japanese. However, as an AI text-based model, I don't have real-time information about every manga series. It's possible that "国王陛下" could be the title of a manga, but without further context or specific details, it is difficult to provide a comprehensive answer. If you have any additional information about the manga you are referring to, I would be happy to try and assist you further. Read thousands of manga in the 国王陛下 genre at ManhuaManhwa website.