Maken no Valkyria

Every single classmate is a beautiful girl! The world is one where monsters run rampant. And the "Magic Swords" used to hunt monsters can only be wielded by women... or so it was supposed to be. Naoto Fujiwara becomes the first man in history to be chosen as a partner by a "Magic Sword." What's more, he has been chosen by the legendary Magic Sword, the primordial Magic Sword 00. Naoto now studies at a Magic Sword institution filled with beautiful girls, alongside the incredibly charming heroes known as the "Brides of the Magic Sword" who wield these swords. The curtain rises on a school × battle × harem story...!! (Source: Takeshobo, translated)