The Guardian Hero

World holds many secrets and mysteries than it lets on from many prying eyes.

One of those secrets is that few government services actually haven't been abolished, many battlefields and clashes masked as battles against heroes and villains, correct in a way.

An agent of a hidden Japanese military service, which was a hailed as best in the past, JSDF, struggles with his double life as he pushes on.

Enter Takanashi Izuya, high ranking personnel and temporary teacher at UA at only 15 years old?! Many surprises are withheld in our prodigy protagonist.
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Disclaimer: I don't own Boku no Hero Academia by Kouhei Horikoshi. Plot and some OCs are mine tho, with references to some other fanfictions.

Still unsure of the hero alias, currently Karna. Unknown ships yet. Potentially OP Izu?