Hundred

A mysterious entity known as Savaga has arrived on Earth, and the only means of resisting it is a weapon called Hundred. The main character, a student named Hayato, seeks to master martial arts using this weapon. He enrolls at Little Garden, a battleship-based university. Upon arrival, he is unsettled by his roommate, Emil, who appears to know him personally. Shortly after the enrollment ceremony, Hayato is challenged to a duel by Claire Harvey, the university's most powerful martial arts expert.