Are there any novels in which the male protagonist is a Japanese officer? Finally, the man and the woman immigrated.

Love Letter is a film adapted from the novel Paper Crane by Japanese novelist Yasunari Kawabata. The film tells the emotional story between a young Japanese officer and a young female student during World War II. The hero is a Japanese navy pilot and the heroine is a female student studying at Keio University. The two met by chance, and their feelings gradually sprouted in the correspondence. However, after the war broke out, the hero was ordered to go to the battlefield, so the two separated. After the war, the hero wrote a love letter to the heroine, expressing his feelings for her. In the end, the hero died in a flight accident, while the heroine went to the United States to study and started a new life.

Under the Cherry Tree was written by Japanese writer Keigo Higashino. The hero of this novel is a Japanese officer and the heroine is a female singer of the Republic of China. They met in Chongqing, China on 1945, and launched a love story that transcended national boundaries and cultural differences in the context of war and politics. Finally, after the war, the hero and heroine immigrated to America together and started a new life.