Hundred

Hundred summary:

“Hundred” – this is the only weapon that can oppose the mysterious life form “Savage” which is attacking the Earth. The protagonist Kisaragi Hayato uses the Hundred’s “Master of Martial Arts” to be on par with them, achieving the matriculation into the battleship university “Little Garden”.
But――
“We’ve already met, you know, Hayato――!”
“Oh… And you are…?”
Around his room mate Emil Crossford, who also knows him well (?) for some reason, Hayato starts feeling uneasy. Furthermore, just after the matriculation he is being challenged by “Queen” Claire Harvey, the academy’s strongest master of martial arts, to a duel…?!