"One-Million Year Trip: Bander Book" is a science fiction anime that explores themes of survival, evolution, and the resilience of life across vast stretches of time. The narrative begins with a young boy named Bander, who lives on a distant planet with his family. After a catastrophic event destroys their home, Bander is separated from his parents and embarks on a journey across space and time. His survival is aided by a mysterious, sentient book that contains knowledge from an ancient civilization, guiding him through the challenges he faces.

As Bander travels, he encounters various alien species and civilizations, each representing different stages of evolution and societal development. These encounters highlight the diversity of life in the universe and the interconnectedness of all beings. The sentient book, which serves as both a guide and a companion, reveals fragments of its own origin and the history of the ancient civilization that created it. This civilization, now extinct, sought to preserve its knowledge and wisdom for future generations, embedding it within the book.

Throughout his journey, Bander grows from a frightened child into a resilient and resourceful individual. He learns to adapt to harsh environments, confronts moral dilemmas, and grapples with the weight of the knowledge he carries. The narrative is punctuated by moments of introspection, as Bander reflects on the nature of existence, the passage of time, and the legacy of those who came before him.

The story culminates in Bander's realization that his journey is not just about survival but also about understanding the purpose of life and the responsibility of preserving knowledge for future generations. The sentient book, having fulfilled its role, ultimately merges with Bander, symbolizing the unity of past and present, knowledge and experience. The anime concludes with Bander continuing his journey, now as a guardian of the ancient wisdom, ready to face the unknown challenges of the future.