Does this really have no volume 2??

ch 7 might be the start of a 2nd vol

Chapter 7 is Chapter 5, I had to label it that way because the chapters here are a mess. There are only 5 chapters, the first four are in the digital and physical releases, 5 is only available on Pixiv. Yes, it is complete as unfortunately at present there are no plans to continue this adaptation. If you want a little more of the story there is another adaptation by a different artist for a BL anthology. It's shorter than this one and only covers Rei's chapters from the novel but it's more faithful to the source material