The narrator reflects on Naoko's letter, experiencing a deep, recurring sadness that overwhelms him each time he reads it. This emotion is reminiscent of the pain he felt when looking into Naoko's eyes, suggesting a profound and unresolved connection to her. The sadness is intangible and persistent, leaving him with a sense of helplessness as he struggles to contain or understand it.

This passage illustrates the complexity of love and loss, highlighting how certain memories and feelings can linger without resolution. The narrator's inability to escape this emotional weight signifies the enduring impact of Naoko on his life, marking a poignant moment in his journey through grief and longing.