Summary and Preview
Sergeant Kai tirelessly takes on the hardest and most dangerous responsibilities, causing his fellow soldiers to give him the nickname "Hagane no Shinzou" (Steel Heart). He claims he has no concern for anything but success and preserving his own life, but the rookie Kazuma sees how much it bothers him when soldiers are treated as expendable. Kazuma believes Kai has a much more ambitious and noble goal, and plans to help him reach it at any cost.
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