Tengoku Daimakyo - S01

Fifteen years ago, a catastrophe devastated human civilization, leaving dangerous, man-eating monsters to roam the ruined lands. These creatures threaten what remains of humanity. In the midst of this chaos, an isolated facility provides shelter for children, raising them in relative peace. But as some of these children begin to learn about the world beyond the nursery's walls, their curiosity about the outside grows. Elsewhere, two young survivors, Maru and Kiruko, travel together in search of a mysterious place known as Heaven, each driven by personal reasons. Haunted by past tragedies and hidden sorrows, they hope to find answers-not just for the suffering they've endured, but for the broken world around them.