Nagano Middle School, or officially called the 4th State Middle School of Nagano Prefecture, is the school Ganta Igarashi, Mimi and Yamakatsu used to attend before the Red Man massacred the entire class with the exception of Ganta.
- Male: a plain white shirt with the school's logo stitched onto the breast pocket, black pants.
- Female: white shirt with a red ribbon tied in a shoelace knot and a black short skirt.
- Both uniforms come with a light brown sleeveless sweater.
- The Nagano Prefecture is based off the real Nagano Prefecture in Japan.