: Search for "Grave of the Fireflies (Hotaru no haka)" and look for the BluRay or 720p tags. This site often has high-quality fan-made and official translations in dozens of languages.

You can find and download subtitles for this specific release from several reputable subtitle repositories. Here are the direct paths:

: Specifically catered to movie rips, this site usually has clean SRT files for common 720p BluRay versions.