Goodbye, Silent Navy: The Classmate Who Rode the Subway is a nonfiction work by Ken Ito that begins with a university classmate who became a perpetrator in the Tokyo subway sarin attack and traces the background of the case and the human turning points behind it. It connects personal memory with a public tragedy and asks why an ordinary student moved toward a grave crime.

A nonfiction work that asks where a person's path diverges through the grave crime of a classmate.