Mr. Y. has to finish his last job as a hit man... He has to, because it is a moral obligation for him to finish this job for which he is paid in advance, because he is a Kantian moralist. But he has only one problem to overcome: Mr. Y. has only one day to live.

Or two.

Almost since the day he was born, the hypochondriac hitman Mr. Y. has gone to bed every night certain that he will not see the next day. Because he is afflicted with so many diseases... He also suffers from chronic misfortune. He devoted everything to his profession and tried to cure his loneliness with the life stories of famous hypochondriacs from the world of literature and philosophy, such as Poe, Proust, Voltaire, Tolstoy, Molière, who were known to have suffered imaginary, psychological or great physical pain. In this last work, he pursues his target for a long time, and then comes the final blow. But each time chronic misfortune or rare symptoms intervene. After each failed attempt, Mr. Y. will resort to new methods, revealing surprising commonalities with the famous hypochondriacs whose lives he has read...

"[Proust] had predicted his death for so many years that neither his friends, nor his critics, nor his publisher, nor his readers believed him. But, despite their distrust and skepticism, Mr. Proust finally died.

His physician said it was an attack of bronchitis. His death is known to have been caused by vertigo, ear infections, uremia, influenza, facial paralysis, a heart infarction, a brain tumor and a failure to find lost time. During all those years of following his blind luck, Mr. Proust was never afraid of illness. The only thing he feared, like me, was dying before completing his work."