- The novel is divided into nine chapters.
- It has been nine years since Eiji Miyake last saw his father's attorney, Akiko Katō.
- Eiji Miyake's twin sister Anju died nine years ago. (TBC)
- Eiji Miyake has been living on the island of Yakushima for the last nine years. (TBC)
- At the start of the novel, Eiji Miyake has been alive 7,290 days. The figures in this number add up to nine.
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