D ACADEMY!Retired Hero Blade is enjoying his time at school to the fullest. Now that he's made one hundred friends, he plans to relax and take in the "normal" life. But that may not be possible, what with the Overlord's daughter showing up, the students taking part in a battle royale-style training session, and monster birds attacking the capital. Plus, Earnest attempts a fiery diet, and it turns out Blade never learned to swim. Each school day brings a new adventure and a new chance for Blade to make even more friends!