Airi Sezaki Hierarchy: Top of the class (Gyaru group) Personality/Traits: Usually a bright and popular girl. She hides a sadistic streak deep inside. In middle school, she kept Hinako—the cutest girl—by her side out of a "calculated move to make herself look better." After school, she feels a warped sense of omnipotence and excitement from the act of making Hinako filthy and broken. Called by Hinako: "Ai-chan" Called by her group: "Airi" Called by outsiders: "Sezaki-san"

Hinako Hanamura Hierarchy: Bottom of the class (Plain, quiet group with few friends) Personality/Traits: Fragile, introverted, and extremely quiet. She harbors deep affection and dependency toward Airi, the only person who paid attention to her in middle school. Even though she is aware of Airi's "calculations," she happily accepts all abuse out of the feeling that she'll "do anything just to be together." Called by Airi: "Hina" / "You" (blunt) Called by her group: "Hanamura" / "Hanamura-san" Called by outsiders: "Hina"

Ichika Miyazono Hierarchy: Top of the class (Airi's group) Personality/Traits: A bright, honest, and high-energy gyaru whose trademark is her many piercings. However, at her core, she is a dangerous girl who is "bored with daily life and constantly seeking interesting stimulation or thrills." Called by Airi: "Ichika" Called by her group: "Ichika" Called by outsiders: "Miyazono-san"

Aoi Nanakura Hierarchy: Top of the class (Airi's group) Personality/Traits: A gyaru who hangs out with Ichika and the others; she often stays out late and acts flashy. She doesn't intervene as aggressively as Ichika, but she serves as an important foil—a friend with a cold perspective who helps Airi appear to others as a member of the "perfect gyaru group." Called by Airi: "Aoi" Called by her group: "Aoi" Called by outsiders: "Nanakura-san" Called by Hinako: "Aoi-san" (when trying to fit in)

Sakina Machiya Position: Top of the class (Airi's group) Personality/Traits: One of the gyarus who hangs out with Ichika and Aoi. She has a lighthearted attitude and is sensitive to flashy events and school hierarchy dynamics. Called by Airi: "Sana" Called by her group: "Sakina" Called by outsiders: "Machiya-san"

Yuko Hyodo Hinako's friend. A girl characterized by her short haircut. Personality: Caring with a strong sense of justice. Role: She is always worried about Hinako, who stays quiet in class, and looks after her in various ways. Her friendship with Hinako is genuine, but because of her strong sense of justice, she eventually becomes the catalyst for a major breakdown. Called by Hinako: "Yuko" Called by her group: "Yuko" Called by outsiders: "Hyodo-san"

Yoshimi Matsushita Hinako's friend. A quiet-looking girl wearing glasses. Personality: Introverted and silent. Role: The person who accidentally witnesses the "secret ritual for two" that Airi and Hinako perform in the chemistry lab after school. By capturing that scene in a photograph, she pulls the trigger that wildly derails the story. Called by Hinako: "Yoshimi" Called by her group: "Yoshimi" Called by outsiders: "Matsushita-san"