Manga by author Kobayashi Motofumi

A "what-if" alternate history in which the Japanese Self-Defense Forces (JSDF) fight a desperate struggle against the Soviet Union after it launches a surprise invasion on Japan during heightened Cold War tensions.*This is the original story ("Tokyo Wars") as published in 1991, not the 2008 re-release under the name "Raid on Tokyo", though there are few differences to note other than the title.