Finding a direct .srt file for can be difficult as it is a niche, straight-to-video Japanese film from 2007. However, official subtitled versions were historically handled by distributors like Media Blasters .
For obscure, foreign-language, or niche films like this, mainstream subtitle sites might not have the best options. Here are the best places to look: Kekko Kamen Royale Subtitles English Srt File