I talked to my sons (20yo twins) about this case. When talking about the craziness of three 17yo perps (together with Sigg and Holder) with little girls, the subject of anime/manga came up. Most of the little girls drawn are dark haired (or white or red, not much normal dirty blond stuff). They are very sexualized. One of my boys used to be very into it and really feels like it is a trap. He ended up throwing all of his out. He felt it objectified girls (stereotyped them with big wide eyes, uniform looking clothing) and sexualized them. He said in Japan it's huge and he's read on several blog posts that these "muses" are meant for men's pleasure. It's been on my mind. If something like this is true, I don't think he groomed her at all. I think he could have had a violent fantasy and had an opportunity.