Yoshinori returns after six years to his family house, where his mother Etsuko lives alone. His decision to return is sparked by the seventh anniversary of his younger brother's death. He brings along his fiancée Kanae, who is pregnant. Etsuko warmly welcomes them both, but Yoshinori can't help but think that something is strange. That night, Kanae is struck by "a sound that must not be heard", and then the hell really begins.
Heita Tomishima is a very conscientious but awkward young man at a mid-sized construction company. He loves working on-site, but one day is suddenly transferred to Operations, a unit whose work is totally outside his comfort zone. Its remit is to land major projects, including public works, and in-house it's cynically known as the Bid Rigging Department. Working under a crusty-old director, a crass macho type, a go-getter doyenne, and a cunning manager adept at hiding his true intentions, Heita dedicates himself to winning a public works contract worth billions.
Nagi Oshima quits her job, cuts off everybody she knows (including her boyfriend), quits social media and cancels her cellphone. To restart her life, she moves to an old apartment in the suburbs of Tokyo. She wants to have a pleasant and free life, not caring about other people.
In Tokyo, an old person, who lived alone, is found dead. Detectives from the Police Station investigate the case. According to the victim's neighbors, a woman sometimes came in and out of the victim's home. That woman is Miki Yamamoto. She does housework for her customers. The detectives from Police Station visit Miki’s house. What is the truth behind the cases?
Kazuhisa Fukase graduated from a prestigious university, but he leads a boring life. His only strength is making delicious coffee. Whenever he makes coffee, he is reminded of his friend Yoshiki Hirosawa. He was friends with Yoshiki Hirosawa back in their university days, but Yoshiki Hirosawa died on a snowboarding trip 10 years ago. One day, he meets Mihoko Ochi at a coffee shop. He is strongly attracted to her. Kazuhisa Fukase goes to a professor’s retirement celebration at a university. There, he meets Kosuke Asai who went snowboarding with Yoshiki Hirosawa on that fateful trip. Journalist Toshio Ogasawara also appears there. He has been investigating Yoshiki Hirosawa's death.
Takashi Hiyama works as a cafe manager. He has lived alone with his 4-year-old daughter since the death of his wife Shoko. Shoko was killed by three 13-year-old boys 4 years ago. The three boys were protected by the Juvenile Act, but Takashi and Shoko's mother were hounded by the media and their lives exposed. Now, even though Shoko's friend (Kana Kurashina) and cafe employee (Yudai Chiba) try to dissuade Takashi, he begins to search secretly for the three boys. Someone then makes an attempt on the boys' lives one by one. Detectives suspect Takshi as he made threats in the media 4 years ago that he would seek out revenge if the boys were not prosecuted. Meanwhile, Takashi tries to find the truth about the three boys.
Izumi Fujimoto is an actress, known for Saiaku no sotsugyôshiki (2013), Sakamoto kun wa mitamne dake ga majime (2015) and Kamen byôtô (2020).