American School is Nobuo Kojima's early masterpiece and the winner of the 32nd Akutagawa Prize. The novel describes a group of Japanese teachers who teach English visiting American schools during the occupation of Japan after the war. Existing research focuses on the internal response of Japan to the "outsider" the United States from the perspective of the politics of language. But this kind of research cannot reveal the diversity of novels. If we start from the perspective of inter-individual relationships and take Isa, one of the main characters in the novel, and his foot injury as clues, we can see that Nobuo Kojima is not only reflecting Japan's attitude towards the "other", the United States, but also revealing the hypocrisy of Japan's so-called group consciousness.