Some MKVs are upscales from 720p sources. Verify group reputation.
: MKVs allow for "soft-coded" subtitles, which can include professional signs and songs translations from groups like Chihiro or Coalgirls . grisaia no kajitsu mkv
is the safest all-in-one MKV pack for Grisaia . VCB-Studio if you have a modern player (hevc 10-bit). Some MKVs are upscales from 720p sources