In a future where humanity has conquered mortality through a scientific breakthrough, the last mortal man on Earth, a 118-year-old, reflects on his life's paths before journalists and a curious audience. His reflections dive into the multiple possible outcomes that could have unfolded from a single moment of choice in his youth. This moment revolved around a pivotal point in his childhood when, faced with his parents' divorce, he had to decide whether to stay with his father and experience a life in one city or move with his mother to another. Each decision branches into a vast tapestry of life possibilities, exploring the myriad paths his life could take, including different lovers, careers, and personalities, depending on the choices he makes at pivotal moments.

As he narrates these potential lives, the narrative explores themes of love, decision-making, and the human condition, questioning the very nature of choice and its impact on personal destiny. His stories are not just about the different lives he could have led but also an exploration of the concept of time, existence, and the essence of being. Through the prism of his memories and imagined scenarios, the film delves into philosophical musings about what it means to live a meaningful life, the impact of seemingly trivial choices, and the interconnectedness of all possible futures, painting a rich and complex picture of human potential and the myriad paths life can take.