This is a book introduced in Kota Ishii's "The Art of Writing Books," but please be aware that it deals with a heavy theme.
When I read the book "The Courage to Be Disliked," I learned the concept of separating others' tasks from my own. While reading this book, this way of thinking stayed with me.
The families of victims stopped in time from the moment their high school son was killed; there is neither past nor future, and no matter how many decades pass, their wounds never heal.
On the other hand, the perpetrator, Juvenile A, is protected by the Juvenile Law, has successfully reintegrated into society and become a lawyer, without offering any apology or compensation to the victims' families, seemingly "rehabilitated."
The exchanges between the author and the now adult Juvenile A make one's guts boil with anger while reading, but whether Juvenile A repents or apologizes is Juvenile A's own task. Forcing Juvenile A to repent or apologize would mean stepping into another person's task, which becomes a source of suffering.
The victim's father was barely holding on to live along with his family, and as a result, he spent his life desperately working on his own tasks. It is extremely unfair and absurd, but if there is any hope to be found, I would like to see it in the father's fierce determination to "protect the remaining family."