This dataset is an extract of Subtitles from anime. The original files are sourced from nyaa.si.
Dataset is in Advanced SubStation Alpha (colloquially known as as ASS) SSA/ASS Specs.
If you're looking for programmatic access, you may parse the file with this python library.
import ass… See the full description on the dataset page:
https://huggingface.co/datasets/KaraKaraWitch/AnimuSubtitle-JP.