The "vol1rar" part suggests this is the first volume of the series, packaged in a .RAR archive for distribution.
The file name indicates that this is a repacked, compressed version of the content. 241129 bishokuke no rule vol1rar repack
: Including missing updates, translation patches, or community-made fixes directly into the core archive so the end-user doesn't have to install them separately. Why File-Naming Schemes Matter The "vol1rar" part suggests this is the first