The story takes place over a 24 hour period. In the southernmost part of Japan, 20 fishing boats of an unknown nationality suddenly fire upon and occupy parts of the Hateruma archipelago. Members of the Japan Coast Guard are detained. Under the extremely tense situation, the Japanese government sends Aircraft Carrier Ibuki and an escort fleet to the area. Ryota Akitsu (Hidetoshi Nishijima) is the captain of the Aircraft Carrier Ibuki and Toshiya Niinami (Kuranosuke Sasaki) is second-in-command. It is now 6:23 am. and Japan faces one day which they never have before.

In 1868, a battle between new government forces and shogunate forces are about to take place in Edo. Katsu Kaishu (Hiroshi Tamaki) wants to avoid useless bloodshed and sends a peace envoy to Takamori Saigō, but Katsu Kaishu is unable to get a response from Takamori Saigō. One day, Katsu Kaishu meets high school teacher Mikako (Satomi Ishihara) and her student Masaya who is captivated by the shogunate. Mikako and her student Masaya tells Katsu Kaishu that they are from the future. Katsu Kaishu takes care of Mikako and her student Masaya, while Mikako hopes to go back to the future where she came from.

An environmental analyst is asked by the police to determine if two deaths by hydrogen sulfide poisoning are an accident - or a murder. But when he meets a young woman at both sites, a scientific mystery begins.

Set in the Three Kingdoms period of Chinese history, the story focuses on Cao Cao in his old age, exploring the areas of military tactics, love, and the relationship between father and son.