K, the son of a Shinshu priest, is Sensei’s childhood friend; he’s deceased in the novel’s present. During secondary school, K is adopted by a wealthy doctor’s family, who agree to pay for his university education on the condition that he becomes a doctor. However, K has no interest in becoming a doctor and lies about his coursework, studying philosophy and religion instead. When the family discovers the truth, they disinherit him, and K is forced to pay for his own education. Determined to maintain his rigorous studies despite the additional burdens of work, K becomes an obsessive, almost fanatic worker. Despite his incredible intelligence, K develops unrealistic, grandiose ideas about the power of self-discipline and becomes become increasingly antisocial and eccentric. Sensei, hoping to help, offers him a place to stay at Okusan’s house. Though K’s mental health improves, Sensei’s plan backfires as K, like Sensei, falls in love with Ojosan. K is torn between his religious ideals (namely chastity) and his romantic desires. Hiding his own romantic interests, Sensei manipulatively shames K for betraying his values. K becomes increasingly emotional unstable and Sensei, afraid that K plans to marry Ojosan, secretly marries Ojosan behind his back. Heartbroken, lonely, betrayed, and ideologically conflicted, K kills himself. K’s grave, which Sensei visits weekly in repentance, comes to symbolize destructive power of guilt.

K  Quotes in Kokoro

The Kokoro quotes below are all either spoken by K  or refer to K . For each quote, you can also see the other characters and themes related to it (each theme is indicated by its own dot and icon, like this one:
Loneliness and Friendship Theme Icon
).

Part 1: Sensei and I Quotes

But now, when Sensei is dead, I am beginning to understand. It was not that Sensei disliked me at first. His curt and cold ways were not designed to express dislike of me, but they were meant as a warning to me that I would not want him as a friend. It was because he despised himself that he refused to accept wholeheartedly the intimacy of others. I feel great pity for him.

Related Characters: The Narrator (speaker), Sensei  , Ojosan (Shizu) ,
Related Symbols: Sensei’s Letter
Page Number and Citation: 8
Explanation and Analysis:

Some might say that I was foolish and naïve. But even now, I feel a certain pride and happiness in the fact that my intuitive fondness for Sensei was later shown to have not been in vain. A man capable of love or should I say rather a man who was by nature incapable of not loving; but a man who could not wholeheartedly accept the love of another—such a one was Sensei.

Related Characters: The Narrator (speaker), Sensei  , , Sensei’s Uncle  
Page Number and Citation: 12
Explanation and Analysis:

“The memory that you once sat at my feet will begin to haunt you and, in bitterness and shame, you will want to degrade me. I do not want your admiration now, because I do not want your insults in the future. I beat with my loneliness now, in order to avoid greater loneliness in the years ahead. You see, loneliness is the price we have to pay for being born in this modern age, so full of freedom, independence, and our own egotistical selves.”

Related Characters: Sensei   (speaker), Sensei’s Uncle  , , The Narrator
Page Number and Citation: 30
Explanation and Analysis:

Part 3: Sensei and his Testament Quotes

I am sure that if I had spoken to her with a truly repentant heart—as I did always to the spirit of my dead friend—she would have forgiven me. She would have cried, I know, from happiness. That I refused to tell her the truth was not due to selfish calculation on my part. I simply did not wish to taint her whole life with the memory of something that was so ugly. I thought that it would be an unforgivable crime to let fall even the tiniest drop of ink on a pure, spotless thing.

Related Characters: Sensei   (speaker), Ojosan (Shizu) ,
Related Symbols: Sensei’s Letter
Page Number and Citation: 237
Explanation and Analysis:

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.

Related Characters: Sensei   (speaker), The Narrator ,
Related Symbols: K’s Grave, Sensei’s Letter
Page Number and Citation: 243
Explanation and Analysis:

Though I had resolved to live as if I were dead, my heart would at times respond to the activity of the outside world, and seem almost to dance with pent-up energy. But as soon as I tried to break my way through the cloud that surrounded me, a frighteningly powerful force would rush upon me from I know not where, and grip my heart tight, until I could not move. A voice would say: “You have no right to anything. Stay where you are.”

Related Characters: Sensei   (speaker), Ojosan (Shizu) , , Sensei’s Uncle  
Related Symbols: Sensei’s Letter
Page Number and Citation: 243
Explanation and Analysis:

I turned to my wife, who had reminded me of its existence, and said: “I will commit junshi if you like; but in my case, it will be through loyalty to the spirit of the Meiji Era.” My remark was meant as a joke, but I did feel that the antiquated word had come to hold a new meaning for me.

Related Characters: Sensei   (speaker), Emperor Meiji  , Ojosan (Shizu) ,
Related Symbols: Sensei’s Letter
Page Number and Citation: 245
Explanation and Analysis:
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K  Character Timeline in Kokoro

The timeline below shows where the character K  appears in Kokoro. The colored dots and icons indicate which themes are associated with that appearance.
Part 3: Sensei and his Testament
Loneliness and Friendship Theme Icon
Mentorship Theme Icon
...into their home—a man who significantly influences Sensei’s pessimistic view of life. Referred to as “K” by Sensei, this man was his childhood friend and accompanies Sensei to university. Sensei holds... (full context)
Loneliness and Friendship Theme Icon
Self-Reflection and Living in the Past  Theme Icon
K and Sensei enter the same educational department at school. Without guilt, K begins to follow... (full context)
Loneliness and Friendship Theme Icon
Self-Reflection and Living in the Past  Theme Icon
K works harder than ever, but the situation continues to worsen with his foster family. Eventually,... (full context)
Loneliness and Friendship Theme Icon
Modernity vs. Tradition Theme Icon
Self-Reflection and Living in the Past  Theme Icon
Sensei, pretending to embrace K’s lifestyle, persuades K to move in with him. Okusan is unhappy about this, but he... (full context)
Loneliness and Friendship Theme Icon
Sensei senses contempt from K but knows that K needs to relax and become more human: having lofty ideals is... (full context)
Loneliness and Friendship Theme Icon
Modernity vs. Tradition Theme Icon
Self-Reflection and Living in the Past  Theme Icon
Sensei goes for a walk with K, trying to gauge his feelings for Okusan and Ojosan. K seems more interested in his... (full context)
Loneliness and Friendship Theme Icon
Sensei’s jealousy intensifies, and he compares himself unfavorably to K. Sensing Sensei is unhappy, K offers to return home, but Sensei insists they travel on.... (full context)
Loneliness and Friendship Theme Icon
Modernity vs. Tradition Theme Icon
Mentorship Theme Icon
Self-Reflection and Living in the Past  Theme Icon
Walking the next day, Sensei regrets not sharing his true feelings with K instead of arguing. They return to Tokyo, and Sensei notices subtle signs of Okusan’s favoritism... (full context)
Loneliness and Friendship Theme Icon
Self-Reflection and Living in the Past  Theme Icon
Sensei debates confessing his love to Okusan, but he hesitates, worrying Ojosan prefers K. Though he isn’t afraid of rejection, he dreads the idea of marrying someone who loves... (full context)
Loneliness and Friendship Theme Icon
...now might look contrived. Unsettled, he leaves the house to wander Tokyo aimlessly. Puzzled by K’s uncharacteristic confession, he wonders what overcame his friend and decides to learn more about K.... (full context)
Loneliness and Friendship Theme Icon
Some days later, Sensei visits the university library. K finds him and asks to go for a walk. Sensei agrees, and K asks Sensei... (full context)
Loneliness and Friendship Theme Icon
Self-Reflection and Living in the Past  Theme Icon
K breaks down. Speaking as if in a dream, he asks, “Am I prepared….?” Then: “Why... (full context)
Loneliness and Friendship Theme Icon
Modernity vs. Tradition Theme Icon
Self-Reflection and Living in the Past  Theme Icon
Returning from his walk, Sensei begins to feel guilty, but he says nothing to K. Dinner is awkward and Sensei begins to wonder how to tell K. Several days pass,... (full context)
Loneliness and Friendship Theme Icon
Modernity vs. Tradition Theme Icon
Mentorship Theme Icon
Self-Reflection and Living in the Past  Theme Icon
Sensei finds K’s suicide note and is relieved that it makes no mention of him. In the note,... (full context)
Loneliness and Friendship Theme Icon
Modernity vs. Tradition Theme Icon
...a soldier, Okusan takes charge, ordering Sensei to fetch the doctor and police. Sensei learns K cut a carotid artery and died instantly. He and Okusan clean the room and move... (full context)
Loneliness and Friendship Theme Icon
Modernity vs. Tradition Theme Icon
...but a dark shadow looms over him. After the wedding, Ojosan asks Sensei to visit K’s grave together. They do, but Sensei vows never to do so again. Despite his hopes... (full context)
Loneliness and Friendship Theme Icon
Self-Reflection and Living in the Past  Theme Icon
...else, does not understand him, and he often feels completely alone. Occasionally, he wonders why K killed himself. At first, he considers love, then clashing principles. Later, however, he considers that... (full context)