A concise overview of the history and social justificiations around Japanese ritual suicide. In 100 pages, the book does a good job of showing what and how the procedures around it are done, but I wish it did more to explain /why/ such a practice endured for so long.
Granted, the book explores a great deal into the societal pressures around when and why seppuku was expected, and further exploration of these themes might be made by studying the Death Poems of those about to commit, as well as looking at the wider cultural history these elites were in.
The scholarship for this book does appear sound. Looking up the author online, it's claimed that he received the Order of the Sacred Treasure in 1986 for his works on spreading Japanese culture, I couldn't find any official sources to back up this claim.