Usually you only see that END when a manga series is completed. I was hoping maybe it'd pull a Saiyuki and continue the series under a similar but different name (Saiyuki -> Saiyuki Reload -> Saiyuki Reload Blast). But then someone linked me to that ultra-scary law being considered in Japan (regarding copyright and authorial ownership of a work) and that other mangaka have ended their series prematurely with just as many loose ends as a result of it and now I'm beginning to think maybe it really is the ending.