It was formerly a DMM game, but died and migrated to Nijiyome afterwards. I seem to remember the gameplay itself being okay, and actually having a lot of high rarity girls, though I can't remember if it was because the rates are actually good, they gave out a lot of free stuff, or if I was just lucky. Problem was that the first event really killed it for a lot of people. Basically the event wanted you to farm event maps for points, which is all right on it's own, but the servers were really not up for the task at launch. So the event maps were super laggy which obviously isn't fun when you need to farm these event maps over a period of time.