This is the "label" or studio code, typically associated with the studio Soft On Demand (SOD) or its sub-labels.
Someone may have converted a script, a photo set, or a fan-written "story" based on that specific production into an EPUB (e-book) format. Spam/Malware: JUC-236-HD-.epub
"JUC-236-HD" does not refer to a traditional literary story or a published book. Instead, this alphanumeric code follows the standard naming convention for Japanese Adult Video (JAV) productions. Specifically: This is the "label" or studio code, typically
It is a common tactic on file-sharing sites to disguise video content or malicious software as small document files (like .epub or .pdf) to trick users into downloading them. Recommendation: a photo set
