To avenge the death of his younger sister, Tor Kokonoe enters the prestigious Koryo Academy, a high school dedicated to training its students to wield Blaze—individualized weapons that are manifestations of one’s soul. While the future of a student is often determined by the form their weapon takes, Tor is an Irregular, whose Blaze appears as a shield instead of a melee weapon. How can Tor possibly learn to use his defensive abilities to fight effectively? That’s when the Duo system comes in, a program where students are paired up as battle mates, classmates and roommates. Tor’s is paired with a silver-haired girl from Scandinavia named Julie Sigtuna, who possesses a power the likes of which has never been seen, and shares his thirst for revenge. (Source: Seven Seas Entertainment)

The story begins with Blaze — a weapon that is the manifestation of a human's soul. Tooru Kokonoe happens to be qualified for this, but for some reason his Blaze is not a weapon, but a shield. Moreover, he enrolled in a school that teaches combat skills, and thanks to the school's Duo partner system, he ends up living with a beautiful silver-haired girl. (Source: Anime News Network)