It starts off great.

You get what is essentially a prison break style story line involving kids escaping their fate using their wits to outsmart enemies. The mind games and twists and turns that went into the first two arcs (~37 chapters in total) almost catapulted this manga to what could be considered a great manga. Unfortunately, those 37 chapters represent the high point of the series. The quality would slowly diminish over the next ~75 chapters. There were good moments in these other 75 chapters, but I began seeing the series lose the qualities that made it initially stand out as a good manga. Early on the story was all about the kids struggling to trust each other, trying to survive against great odds using their brains, and having to face tragedy due to the futility of fighting against vastly superior enemies. Unfortunately, that's all absent in the remaining 69 chapters the manga.

For the final 69 chapters, the manga transitions from a survival story with an emphasis on mind games to a battle story with mindless action. The children begin brazenly going on the offensive and repeatedly succeed against their enemies despite the early arcs painting the world outside the farm as being incredibly hostile and dangerous to them... As if they had insurmountable odds to over come. And yet, every time the children are exposed to a scenario that would result in the children coming out on the losing end, or surviving with great losses, the author became unwilling to commit to tragedy and resolved the issues without the children losing much. This kills all the suspense built in first 112 chapters because it never again feels like there are any stakes genuinely at risk.