Not everyone has the privilege of knowing in advance the day they are going to die. Lucio Battistini, a forty-year-old former water polo player with a wife and two young children, knows exactly. In fact, he set the date himself when he received a visit from an unexpected and unwanted visitor, a tumor in his liver, which he named, to exorcise the situation, "my friend Fritz". One hundred days of life before the finish line. One hundred days to leave a beautiful memory for his children, to play with his friends, and above all, to win over the heart of the woman he hurt by betraying her unexpectedly. One hundred days to discover that life is funny and always surprises you. One hundred days during which Lucio decides to deal with the most difficult thing of all: being happy. Because, as Nicolas Chamfort wrote already in the 18th century, "the most wasted of all days is the one in which we have not laughed".