This is the second installment in the series. Usually, a Volume 2 implies improved art style, a continuation of a specific narrative thread, or the introduction of new characters that weren't featured in the first volume.
This signifies that the content has been translated into English. For many fans, especially those browsing international databases, having a high-quality English translation is the "gold standard" for accessibility.
To understand the specific appeal of this release, one must look at the metadata provided in the title: