In "Yesterday," Haruki Murakami explores the theme of memory and its transformations over time. As the story unfolds, characters reflect on their past experiences, demonstrating how memories can shift and reshape one's perception of reality. This notion highlights the fluidity of memory, suggesting that it is not a fixed record but rather a dynamic process influenced by emotions and life events.

Murakami's quote, "As time passes, memory, inevitably, reconstitutes itself," encapsulates this idea. It emphasizes that as we journey through life, our memories evolve, influencing our identity and understanding of the past. The narrative invites readers to contemplate the intricate relationship between time and memory, revealing how recollections can change not just in their details, but in their significance to our lives.