This work is a substantial remake of Tokyo Jikan.

In 1945, an atomic bomb was dropped on Tokyo. In 1989, the Shouwa era didn't end.

When a doppelgänger appears and meets with his double, an explosion occurs which changes the world's history.
Tokio is a mysterious person who travels in time in order to find and stop these doppelgängers.
He then meets a female morgue worker and a detective. The three are called by Masaki Urashima,
only to be told an aeroplane will explode in two days.