Kokoro

Kokoro is a 1914 Japanese novel by Natsume Sōseki, and the final part of a trilogy starting with To the Spring Equinox and Beyond and followed by The Wayfarer. Set in the Meiji era, the novel tells of the acquaintance between a young man and an older man called "Sensei", who holds a secret from his past regarding the death of a friend. (Wikipedia)