In the year 2011, 3rd of January
One day, a doctor name: Matsuoka Tsuyoshi treated one of his patient in the hospital.
He thought that his patient only caught a normal flu, nothing serious and only needs some rest, but who knows that the 2nd day, that patient began to have most of his organs fail and die!
Later on, more and more other patients and people began to have the same conditions as the 1st patient!
The whole japan began to panic and the unknown flu(virus) began to spread to the peoples and tragedy follows!