I (Yuko Takeuchi) is a mystery novel writer. I receive a letter from Kubo (Ai Hashimoto), a reader of her novel and a university student. Her letter states that she hears odd sounds from the room where she lives now. I becomes interested by the letter and they being to investigate. I and Kubo learn of people that lived in the apartment and their experiences including a suicide and murder.

Movie contains the stories of three people: Suzuki (Toma Ikuta), Kujira (Tadanobu Asano) and Semi (Ryosuke Yamada). Suzuki is a former middle school teacher. His girlfriend was killed, which led him to quit his job and attempt to take revenge on her murderer. To do so, Suzuki has to infiltrate the underground world of criminals. Kujira is a contract killer for hire. He makes his targets fall into confusion and eventually commit suicide. Semi is a contract killer who uses the knife to take out his targets.

In the final days of World War II, occupying Japanese forces in the Philippines face resistance from the local population and the American offensive. The dwindling Japanese soldiers attempt to survive through the horrors of war.

Set in the late 21st century, an MRI scanner is introduced at the National Research Institute of Police Science's 9th Forensics Laboratory. The machine is able to scan the memories from even the deceased. As ethical questions arise over the machine's use, the 9th Forensics Laboratory members, including rookie Ikko Aoki and Chief Tsuyoshi Maki, struggle to solve cases.