<> — that is the only weapon that can oppose the mysterious life form <> visiting the earth. The protagonist, Kirasagi Hayato, aims to become a <> using this Hundred. He managed to get into the battleship university <>. However —

"I wanted to see you, Hayato!!!"
"H-How do you know my name?"

Around the roommate, Emil Crossford, who somehow knows him well (?), Hayato gets an uneasy feeling. What's more, just after the entrance ceremony, he gets asked for a duel by the campus' strongest martial arts master <> Claire Harvey…!?