What book on Christian existentialism is by what Danish philosopher?
Sickness Unto Death (manga): Sickness Unto Death (Japanese: 死に至る病 , Hepburn: Shi ni Itaru Yamai ) is a Japanese manga series written by Hikaru Asada and illustrated by Takahiro Seguchi. The Sickness Unto Death: The Sickness Unto Death (Danish: "Sygdommen til Døden" ) is a book written by Danish philosopher Søren Kierkegaard in 1849 under the pseudonym Anti-Climacus.
Søren Kierkegaard