This is the standard product ID for the game on DLsite.
The phrase "Atrocious Empress" could imply a narrative involving a powerful female character, possibly with negative connotations or a dark storyline. "Bad End" suggests that the story may have a conclusion that is unfavorable or tragic. eng atrocious empress bad end rj403033 exclusive
The game was released in chapters, with new scenes and "BAD END" compilations regularly added for Patreon supporters . This is the standard product ID for the game on DLsite