Apocalypse Zero - S01

The world lies in ruins after a string of natural disasters, leaving survivors to fight for their lives in a broken, chaotic society. Among them is Kakugo, a young boy whose late father left him with extraordinary martial arts abilities and an incredibly powerful suit of armor. Now, Kakugo is determined to restore safety-at least within his school, if not the entire world. But his sister, armed with the same skills and equipment, has a very different goal: she seeks to bring peace by eliminating humanity altogether.