Rina Kannami

Koharu is a dull high school girl who is always alone. Her only hobby is making plastic models. One day, Koharu stops by a mysterious antique shop and purchases a plastic model gun and a toy figure named Alice. After spending the entire night assembling the gun, Koharu wakes up and witnesses bullets flying everywhere in school. She then meets Alice who moves like a human and tells her to get ready for a survival battle called "Girl Gun Fight", where she has to attack her schoolmates with a gun.

At Yurigahara High School, the occult legend of "Yuriko-sama" has been handed down for generations. The existence of "Yuriko-sama" who reigns at the top of the school and brings misery to those who stand against her. The only condition to become a "Yuriko-sama" is to have the name Yuriko. In the new semester, a new "Yuriko-sama" fight begins. In order to save Yasaka Yuriko, her best friend, Shimakura Mizuki stands up and challenges the truth behind the legend.