The original Hinokami Chronicles game received several "Character Packs" that expanded the roster for Versus Mode. The "3 New DLC" mentioned in your query likely refers to a bundle containing:
The string you've provided, , appears to be a formatted filename or title used by unofficial distribution sites for Demon Slayer: Kimetsu no Yaiba – The Hinokami Chronicles on the Nintendo Switch. Specifically, the "NSP" extension refers to a standard Nintendo Switch package format used for installing games and add-ons. DLC Overview: "3 New DLC Pack" DEMSLAY-KNY-THC-NSwTcH-NSP- [3NewDLCPack] -Zipe...
: Featuring her "awakened" combat style. DEMSLAY-KNY-THC-NSwTcH-NSP- [3NewDLCPack] -Zipe...