Based on my investigation, refers to the digital title [Hitorigoto] The story of a childhood friend who lost her memory and became a different person (幼馴染が記憶喪失になって別人になっちゃった話), developed by the circle Hitorigoto . The "patched" version typically refers to unofficial English or Chinese localizations or the developer's post-launch bug fixes. Review: The Memory Loss Narrative
Non-Japanese users noted that subtitle files (.srt or .ass) displayed as garbled text. The update converts the subtitle encoding from Shift-JIS to UTF-8, making them readable on international systems. rj01174141 patched