Story
Soldiers with a history of war were assigned to... the school of girls flying in the sky!? Near future - The earth was invaded by a monster from another world called "false beasts" and was forced into a never-ending defensive battle. Ordinary weapons rarely work, and the only thing that can compete with is the powered suit "Valkyrie Dress", which can only be handled by women equipped with mysterious powers. A man is assigned to the "Third Gakuen", an institution that nurtures and operates women who fight in such a steel dress. His name is [one, two, three lotus].
Synopsis via AniList (English).
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Picked from our own catalogue — same author, or the genres overlap.