Checking amazon japan, looks like Vol.6 came out in November, so it looks to be ongoing..... it looks like Kodansha's the publisher, so hopefully it'll pop up under the Kodansha Comics label- they announced a bunch of licenses a month ago http://kodanshacomics.com/ and took over most of Del Rey Manga's titles [though DRM's staff is handling all their books- it's confusing, but means more manga :)]