: Indicates this is the core game file, not an update (UPD) or downloadable content (DLC).
In short, it's the digital footprint of someone sharing a copy of a beat-'em-up game online. RT-F2-NSwTcH-[BASE]-NSP-(eShop)-Ziperto.part1.rar
: This is the name of a well-known website that hosts pirated console games. : Indicates this is the core game file,
: Because the game is large, it has been split into multiple compressed "parts." You would need all parts (part2, part3, etc.) to extract the full game. RT-F2-NSwTcH-[BASE]-NSP-(eShop)-Ziperto.part1.rar
The string you're looking at isn't a "story" in the traditional sense—it's the filename for a pirated Nintendo Switch game.