A charming story in which a little girl's imaginary friend is, in fact, the Grim Reaper. People die, hilarity ensues. Somehow.

The dark story of the romance between the last child of the Moon and the daughter of Inari, within the Silence of a world bloodstained by Gods and ruled by an order, the Order of Riversky. Follow the story of Hakka Hatsura in her journey within the "Sphere", the Ahriman, as she seeks for her past and for her future.