This is a peculiar book - it's a science lesson and horror novel all in one. Suzuki clinically dissects the curse of the first book, laying it bare on the slab for all to see.
This has two effects. The first is that it is very intriguing. Mostly the horror genre relies so much on unexplainable, vague reasoning, that it comes as a breath of fresh air to have an explanation that makes sense (at least to someone who is as clueless about biology as me!)
Sadly, though, the second effect is that the novel simply isn't scary any more. It's like the always disappointing ending comes right at the start and, while you certainly want to keep reading to find out what happens, without the terror of the unknown there is no real tension.
Add to that the fact that this is a translation and, at times, a painfully clunky one. Translating from Japanese must be impossibly difficult, but I really feel an English editor should have picked up some of the more cringe-worthy sentences that litter this book ('The pair of testicles...looked curiously adorable').
On the whole, a very brave attempt at a different, intelligent kind of horror novel. Well worth reading as a curiosity, but don't expect to be scared witless.