こころ (Kokoro)

Kokoro, written by Sōseki Natsume in 1914, explores themes of friendship, guilt, and the complexities of human relationships. The narrative follows a young man who befriends a reclusive teacher, known as Sensei, who is haunted by the suicide of his friend K. As the protagonist learns about Sensei's struggles and reflections through a series of visits, he ultimately receives a letter that reveals the depth of Sensei's inner turmoil and the impact of past traumas on his life. This novel is notable for its psychological depth and is considered a classic of Japanese literature.