Satoru, a restless student in the year 2403, receives an unexpected visitor: Alisa, a time traveler who arrives with a mission. Together they embark on a journey backward through history, hoping to witness the formative moments of human civilization. What begins as a controlled expedition spirals into chaos when their equipment malfunctions, scattering them across pivotal religious and historical periods. Each era presents its own challenges and mysteries as Satoru struggles to understand why these particular moments matter so much to Alisa's future world. Their accidental tour becomes a race against time itself, forcing them to grapple with questions about how the past shapes destiny and whether history is truly fixed or fluid. The film weaves fantasy adventure with philosophical inquiry, creating a story where witnessing history matters as much as understanding it. Viewers drawn to time travel narratives and explorations of human spiritual development will find plenty to contemplate here.