Hundred

The only thing that can stop the strange Savage life forms that are assaulting Earth are "Hundreds," a type of weapon that gets its name from its capacity to transform into a variety of shapes. People who can use a Hundred in battle are taught to be Slayers, and those who possess one are sought after. Hayato Kisaragi enrolls successfully at the marine academy city ship Little Garden in order to become a Slayer. In contrast, he senses an odd sensation of familiar incongruity toward Emile Crossford, his roommate, who he believes somehow recognizes him from somewhere. Additionally, not long after he enrolls in the school, Claire Harvey, the "Queen" and the most potent Slayer there, challenges him to a duel.