Modern video title animations use subtitle tracks that sync with specific animation frames. An "upd" (update) version ensures that:
This simply denotes that the content is anime (Japanese animation). It distinguishes the video from live-action, games, or other media. video title animation shinjitsu shinki engsub upd
Many small-scale subbing groups operate on Discord. Search Disboard for "Shinjitsu Shinki Fansub." Their #releases channel will have the "upd" pinned messages explaining what changed from the previous video title animation version. Modern video title animations use subtitle tracks that
This is the most likely source. Use the exact search string: "Shinjitsu Shinki" engsub upd. Look for the highest seed count. The "video title animation" is usually bundled in the Specials folder of the torrent. video title animation shinjitsu shinki engsub upd