days is the ending theme of Mekakucity Actors performed by Lia. The song was composed by Shizen no Teki-P (a.k.a. Jin) and a PV for the anime was illustrated and directed by Shidu.
(Source: Kagerou Project Wikia)
On March 2, the President of South Korea is attacked in a marketplace. Han Tae Kyung, an agent who did not prevent the attack, learns that the President will be assassinated in three days' time.
