Kieta Sekai to Tsuki to Shoujo -The world was prayed by the girl living a thousand years-

The protagonist Seiji comes back to his hometown, where he becomes a witness of the mystery behind the series of unsolved murder cases. One by one, every single one of Seiji's old friends, with whom he just met, disappears. The mystery under the moon's light reveals a truth little by little, thus starts the story about the disappearance of the world, the moon, and the girl...