The arch angel Gabriel has come down to Earth looking for his older brother, Michael, who disappeared more than a century ago in human time.
A group of teenagers have been out drinking and generally having a good time. The next morning, they wake up with no memories of what happened to them last night. Investigation reveals several videos made of them torturing and murdering people.
Rairy is an apparently normal high school girl who worries about such things as her grades, finding a boyfriend and what's going on in the world. What she doesn't expect is to develop the ability to see ghosts and angels and to find a diary that enables her to hold conversations with a boy from the past.