If the filenames appear as garbled text (mojibake) after extraction, you may need to use a tool like Locale Emulator or set your system locale to Japanese, as the internal filenames are often encoded in Shift-JIS.
Large .rar files from unofficial sources are frequently used to hide malicious executables. Always scan the downloaded file with updated antivirus software before extracting. How to Use the File Download RJ373932 rar
Codes starting with "RJ" (Radio Jockey) are reserved for audio dramas , ASMR , and voice works . Downloading and Security If the filenames appear as garbled text (mojibake)