thanks man. according to mangaupdates there are only 2 volumes... for a series that started in 2006?

No problem! I was curious about this, so I googled it. I found the magazine's page, which also has all the chapters of it in Japanese for free online viewing. http://mangaairport.com/magazine/jp/ It lists the latest chapter of Gleam as chapter 28, which came out in 2009, after which there isn't any more. I also found the artist's website, which lists her work on other manga series in the years since, as an illustrator. It kind of looks like Manga Airport, a very very small online magazine, folded in 2010, and the series is probably permanently unfinished :( What a shame, I thought it looked interesting.

Actually hold that! I found the US press release from Cross Infinite World that says she will continue the series exclusively in english! It says she's busy making revisions for changes to the volume release and after that, will continue with new chapters. So yay. https://www.theoasg.com/articles/please-save-my-money/crossing-new-worlds/2697