A young postman unexpectedly learns that he has an incurable brain tumor. When he returns home, the Devil awaits him in the form of his doppelgänger. He offers him a pact: for every day he wishes to live longer, something must disappear from the world. The Devil decides what that will be. The postman agrees to this deal. The next day, all phones vanish. On the second day, films disappear, and on the third, all clocks. When all cats are set to disappear on the fourth day, the postman puts a stop to the Devil and does something completely surprising. In his novel, which has sold over a million copies in Japan, Genki Kawamura poses the simple question: What makes a good and fulfilling life?.