[Machine Translation] A father and son take on the challenge of the highest triathlon "Ironman Race" ! The courageous challenge between father and son will make your heart flutter! --Julien, 17 years old and confined to a wheelchair, is looking forward to meeting his father, Paul, who is coming home after a long absence from work. However, Paul, who does not know how to interact with his son, refuses to talk to him. Julien makes an outrageous proposal to his father. I want to run the Ironman with you. Paul, who had competed in triathlons when he was younger, rejects the idea with a single word: "I can't do it. The Ironman race is the most difficult of all triathlons. It is a grueling race even for well-trained athletes. However, Julien, who hates to lose, does not give up. He persuaded his father by planning various strategies. He even persuades his worried mother to join the team. Julien's first words are: "I want to make up for all the time I've lost. They are determined to "make up for lost time" and "make him admit that he is no longer a child. Their reckless attempts soon involve the people around them and turn into a dream for everyone. The day of destiny arrives, and after overcoming various difficulties, will the "Great Days" ever reach their goal?