Live, die, live again.

A few people awoke in an unknown place.
All of them, strangers to each other, are supposed to be dead.

Amid their confusion, a mysterious entity offers to extend their life with a single, non-negotiable condition: they must eradicate various specters in this world. Only the resurrected, such as themselves, could perceive and eliminate these otherwise imperceptible apparitions.

Their revival, however, has its side effects; an abnormally strong libido, the persistent dread of an unpredictable call to battle, and the constant terror of their borrowed time running out.

Still followed by the clutches of death, their cruel daily existence was about to begin...

[Based on the official site and MangaGamer]