Nanimo Nai Kedo Sora wa Aoi

A meteor narrowly misses Earth, but leaves behind a new type of bacteria that consumes all known metals. In Japan, Jinkichi and his classmates struggle to survive as the government offers little assistance. Some students recognize the breakdown of previous societal norms and anticipate a rise in lawlessness. Jinkichi must defend both himself and his classmates from the resulting violence.