The book "Friendship" was written by the Japanese writer Mushanokoji Saneatsu. In this work, the author explores the subtle psychological interaction between the main characters, and also develops the theme of loyalty and mutual understanding in friendship. The plot revolves around two friends who find themselves in difficult life situations and strive to find a way out by supporting each other. Through the subtle language and inner thoughts of the characters, the reader can feel the depth of feelings that accompany the friends throughout the story. The book "Friendship" leaves a feeling of deep understanding of the meaning of true friendship and inner self-development.