Ishimori Uka is very shy and has a hard time making friends. When she was a middle school student, students made fun of her by calling her "stone". Around that time, she met Miura Kai with lemon color hair. Because of him, she entered the same high school. Uka now wants to overcome her shyness and have friends. Kai is a popular student at the school, but he doesn't talk much or seem interested in others. He doesn't know why, but he becomes concerned with Uka. Uka has admired Kai, and she now has feelings for him. Kai has a secret, which no one knows.

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.