Fifteen years ago, man-eating monsters with dangerous abilities rampaged through the world, destroying everything in their wake and annihilating most of the human population. To shelter vulnerable children against these hostile creatures, a special facility was created, providing them with a safe environment to be raised in. Even so, the inquisitive children living there yearn to explore the world beyond the narrow periphery of their nursery, risking everything to do so.
Meanwhile, among the survivors of the outside world, teenagers Maru and Kiruko band together to search for a special place called Heaven, each for their own reasons. Carrying past burdens and tragic secrets, the two hope to find answers to the cruelty they have experienced in their lives and in the world, which still remains in tatters.
[Written by MAL Rewrite]
