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.
Ieji Hisashi, a salaryman who works for a securities company, has a fuzzy memory of the recent five years because of an accident at his job posting. His wife of five years, Megumi and their 4-year-old son seem to wear masks. He can neither tell their facial expressions nor their emotions. He also struggles about his love for them. On the other hand, Ieji feels an attachment to his ex-wife, whom he divorced five years ago, and their daughter. What sort of days did he have in those five years which are a blank to him? Ieji sets out on a journey to find his past self with a mysterious bunch of 10 keys that he has. He becomes aware that he was a cold, career-minded man before the accident, and the persona that is gradually revealed is beyond the imagination of his present kindhearted self.
Life is simple for Sasamoto Sawa, a young housewife, but when the adulteress Takigawa Rikako moves into her neighborhood, so too does a new world of sophistication and sex. After Takigawa is nearly caught in the act, Sasamoto covers for her during the ensuing aftermath, unwittingly involving herself with a handsome teacher named Kitano Yuichi — and discovering her own desires for extramarital passions.
Hanzawa Naoki works as a loan manager at the Osaka Nishi branch of Tokyo Central Bank. One day, Hanzawa makes a loan contract for 500 million yen with Nishi Osaka Steel Company. Hanzawa didn't want to approve the loan, but he had to due to the branch manager's order. Nishi Osaka Steel Company seems financially stable, but the company actually hides massive amounts of debt through fraudulent accounts. The company is caught. Three months later, Nishi Osaka Steel Company goes bankrupt. The bank's branch manager is Asano. He is an ambitious man and tries to shift the blame to Hanzawa. Hanzawa then attends an inquiry about the loan failure at the bank's headquarters in Tokyo. Hanzawa denies fault and promises to retrieve the 500 million yen loan. He did this because it's the only way for Hanzawa to survive as a banker.
Hako was senteced to 7 years in prison on a robbery charge for the host she loved. Ayaka killed her husband to protect their son from domestic violence. These two women became acquainted in prison and forged strong bonds. After they are released from prison, they stay together and begin new lives in the old district of Yanaka in Tokyo while carrying pasts that no one must not know.