So what is this? Short version: it's a game where you dodge danmaku while you have to triangulate a seal that does damage within the confines of crystals on the ground that limit your range. If it sounds confusing, it's simple enough in practice. Then if you beat the stage, you (or rather, Reimu) gets to bukkake them by clicking around on the image. Due to the waves they haves, these games are kinda tough to play. And while the difficulty DOES give some satisfaction to the bukkake-ing but why would you do that to yourself?
I was under the impression that suggestive (but not explicitly sexual) galleries with nudity would fall under Non-H. I suppose I'm very wrong and need to reevaluate my definition.