K’s grave symbolizes Sensei’s secret, lifelong guilt over his role in his friend K’s suicide. As he explains in his letter to the narrator, he and K had fallen in love with the same girl, Ojosan, while at university together. Instead of confronting their shared romantic interest, Sensei goes behind K’s back to marry her. This betrayal, compounded by heartbreak and loneliness, ultimately drives K to suicide. Though K does not blame Sensei in his suicide note, Sensei is consumed by guilt, knowing the role he played in his friend’s death. His own history with his uncle’s betrayal—and the pain it caused him—makes this guilt all the more poignant; while Sensei once believed himself to be better than the rest of the world, he now sees that he is just as greedy, selfish, and sinful as everybody else.
Unable to escape the guilt from his betrayal of K, Sensei increasingly contemplates killing himself. Though he refrains from doing so, fearing the trauma it would cause Ojosan, he feels pulled towards death and resigns himself to living as though he were already dead. His weekly pilgrimage to K’s grave embodies this fatalistic liminality. Increasingly confident that he will end his life in the same fashion as K, Sensei’s graveyard visits serve as both a means of atonement, as well as an omen of where he himself is headed. As such, K’s grave embodies the destructive, gnawing power of guilt: Haunted by his role in his friend’s death and unable to fully face living with his guilt, Sensei already has one foot in the grave.
K’s Grave Quotes in Kokoro
Part 3: Sensei and his Testament Quotes
Finally, I became aware of the possibility that K had experienced loneliness as terrible as mine, and wishing to escape quickly from it, had killed himself. Once more, fear gripped my heart. From then on, like a gust of winter wind, the premonition that I was treading the same path as K had done would rush at me from time to time, and chill me to the bone.

