RJ256808 refers to the adult-oriented strategy and puzzle game Back Alley Tales , originally released on DLsite by developer "sh someya". 

in a small town. Instead of just watching live feeds, you review recorded surveillance footage of seedy back alleys to uncover dark secrets and solve crimes. Characters

[요청복구] RJ256808 뒷골목 이야기 Back Alley Tales - all - 코네

Localization Files: Depending on the source, it may include community-made translations or official language packs (English, Japanese, etc.). 

However, if you’d like a speculative / forensic-style write-up about what such a file could be (based on naming patterns), or a template for analyzing a ZIP file with that name, I can provide that.

Or upload to VirusTotal (if non-sensitive).

On the cassette player in the alley, the final track ended with the barber’s voice saying, "If you want to be remembered, be gentle. If you want to forget, be brave enough to leave a note." The rain stopped. The neon steadied. Mara folded a crane from the discarded program and tucked it into the zipper of rj256808backalleytales.zip, then slipped the case into a slot in the depot's return box—anonymously donating the last of her past to the city she loved in spite of everything.

The "rj256808backalleytaleszip" file is a fascinating example of the types of mysterious and intriguing digital content that can be found online. Through our investigation, we have uncovered the file's contents, which appear to be a collection of creative works, including stories and artwork.

5.2 Detecting Nested Archives

unzip -l rj256808backalleytales.zip | grep -E '\.(zip|rar|7z|tar|gz)$'