An MSDF submarine collides with a U.S. nuclear submarine, crushing all 76 people on board, including its CO, Shiro Kaieda. However, the crew survives. The accident is a cover story to get the MSDF submarine's crew on board the Seabat, a nuclear submarine secretly built by the Japanese and U.S. governments. However, Kaieda loads the Seabat with nuclear missiles and suddenly mutinies and flees.
Shiro Kaieda is appointed the captain of Japan's first nuclear submarine, jointly built by Japan and the United States in top secret. However, he and his 76 crew members go rogue in this story that delves into themes of nuclear war, international politics, and world peace.
Nakagoshi Chikara is married and has two children. His family lives together at a complex in Tokyo. He introduces himself as a novelist, but he is actually a ghost writer and writes essays for famous people. He is usually busy with his writing and doing house chores, but, when he sees people who need help, he can't ignore them. He approaches those people and asks them if they are doing okay and if they have a problem.