The (if "SUMDAYDNE" is an abbreviation or an acronym). The genre or a brief description of the plot.
It is possible that this is a specific file name for a private or niche publication, or perhaps a typo. The suffix "-MM" often refers to (male/male) in digital book communities. SUMDAYDNE-MM.epub
If you can provide any of the following details, I can help you find the information you're looking for: The . The (if "SUMDAYDNE" is an abbreviation or an acronym)