Nanatsu no Maken ga Shihai Suru

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)