Reign of the Seven Spellblades

Nanatsu no Maken ga Shihai Suru
七つの魔剣が支配する

Source

Reign of the Seven Spellblades
Nanatsu no Maken ga Shihai Suru· 七つの魔剣が支配する
novel

Springtime at Kimberly Magic Academy, when new students begin their first year. One boy, clad in black robes with a white cane and sword strapped to his hip, approaches the prestigious school. This young man--Oliver--must form a bond with a katana-wielding girl named Nanao if he's to survive the dangers he's to face at this school that is anything but what it seems! (Source: Yen Press)