Mikaru will be back in Europe with his project G.L.A.M.S. His visit to Europe is planned in March 2018 and consists of a performance at the Belgian convention Made in Asia. This was confirmed by REALive on their Facebook page.
Nothing else has been announced about the duration of the tour as well the tour dates, but this will be soon announced by the tour organization. Made in Asia will take place on March 16, 17 and 18.
Mikaru was in Europe as well, earlier this year, and was a guest at AnimeCon for a performance and Q&A. He brought a few musicians, including Syu, Tetsuto and Erina, so he could perform as a band. In addition, he released an album titled A QUEEN OF THE NIGHT.