Nagano Middle School

Nagano Middle School, or officially called the 4th State Middle School of Nagano Prefecture, is the school Ganta, Mimi and Yamakatsu used to attend before the Red Man massacred the entire class.

As seen in the ending of the anime, it appears that Kasuga Kyōko also attended this school, with Idaki Hitara as her teacher (which is very curious because Hitara didn't appear in the anime at all).

Uniforms
Male: a plain white shirt with the school's logo stiched in the chest pocket, black pants.

Female: white shirt with a red ribbon tied with a shoelace knot, black short skirt.

Both uniforms come with a light brown sleeveless sweater.

Trivia

 * The Nagano Prefecture is based off the real Nagano Prefecture in Japan.