This book tries to argue, despite the author denying it, that mainstream Japanese Buddhism has the right approach to abortion figured out: first, it acknowledges abortion as homicide, but does not seek to ban it. Secondly, it provides rituals for women to mourn the baby, and this allows to heal and move on. Thirdly, it recognizes that sometimes "abortions are necessary", and therefore he thinks that this is the 'much needed' balance in the 'American' discussion of 'viability' vs. inviolability of life, 'freedom' vs. responsibility, 'pro-choice' vs. pro-life.
Many of his assessments of Christianity are wrong, and as scholar of things Japanese, he tends to be more objective in some passages and too enamoured by the subject he's dedicated his life to, to the point that every time you come across infanticide he'll soften it with "but just as a woman opens her legs to give birth, the midwife would also kill the baby by closing hers, so it's symbollically perfect.
He does good, however to show that Shinto, Confucianism and Buddhism did not coexist in some realm of "Oriental perfection and pacifism" but were at war, that the feminist movement has quite a liberationist view that does not acknowledge trauma from abortion or, in any case, minimizes it way too much. To think he spends pages and pages trying to prove that Japan's supposedly peasant endorsed maximization of quality of life is proper a proper conscietous objection to utilitarianism and that it differs from Malthus' and then he, in the last pages, brings overpopulation to the table is utterly laughable. He even matches most of the horridly commonplace talking points: 'still happens', 'what about the women', 'children are abandoned anyway', ' exclusively wanted children make a better society'...
In other words, madness. Read it for the information, but don't allow yourself to be swayed by yet another abortion enthusiast.