Haruta is handsome and smart, Chika is bright and naive. When they were children, they were friends until Haruta's family moved away while he was in the 3rd grade. They meet again during a high school entrance ceremony. After all of these years, Chika is eager to join the wind instrument club. Due to an incident, the wind instrument club is about to be disbanded. Chika can't give up the flute so she attracts Haruta to her side and tries to recruit members from the wind instrument club. The group attempts to solve various cases taking place at their school while they plan to take part in a contest.

On Christmas Eve, a TV broadcasting station receives a phone call. The caller warns "I have set up a bomb at Ebisu in Tokyo." A contract worker for the TV broadcasting station and a housewife are accused by the Ebisu police as being the culprits. During this chaotic situation, a mysterious man silently watches as everything unfolds. A video clip is then uploaded to an online video website. The video contains a demand to talk with the Prime Minister during a live broadcast or a bomb will be detonated at 6 pm in Shibuya, Tokyo. Who is behind the bombings and who will stop them?

An unemployed man named Suzuki is taken in by police after breaking a booze vending machine. When he predicts the explosions of two bombs and claims there are more, the police start to investigate him as a terrorist. However, Suzuki first claims to know about the bombs through psychic clairvoyance, and then claims he was hypnotized to forget. He gives hints about the bombs with riddles while riling up his interrogators, especially senior detective Kiyomiya and his junior Ruike. Things seem to be connected to a disgraced cop named Hasebe, who committed suicide after a scandal some years ago. But is Suzuki actually the perpetrator behind the bombs or not?

Yuri is a high school student in the present day. She isn't happy with her life at home or school. One day, she has an argument with her mother and runs away from home. Somehow, when Yuri later opens her eyes, she realizes that she is in the year 1945. She happens to meet Akira. He is a pilot for a kamikaze unit in the military.