TV-Series
Description
Hana Katsuragi is a student in class 1-A at St. Mihailov Academy, initially serving as an enforcer who instigates daily physical and psychological abuse against classmates Mafuyu Oribe and Tomo Yamanobe. Her actions include regularly throwing the classroom garbage can at them, forcing them to clean up after she deliberately trips over it, and vandalizing Tomo's desk with writings and trash.

Her life shifts dramatically upon encountering Ekaterina "Katja" Kurae, a new student. Hana becomes visibly embarrassed and obsessed with Katja, exhibiting behaviors suggesting a previously hidden attraction. In one incident, she kisses Katja's arm while Katja feigns unconsciousness, leading Katja to blackmail Hana into becoming her personal slave and reserve source of soma. This subjects Hana to daily abuse and sexual torture, which she appears to enjoy due to masochistic tendencies. These experiences grant her advanced BDSM-related skills, like creating complex knots effortlessly.

Hana's association with Katja makes her vulnerable to exploitation. She is abducted by Yuu Kuchiba, who drains her soma to near exhaustion. Later, Friederich Tanner mind-controls her to manipulate conflicts between Taisuku Fujiomi and Katja.

In abilities, Hana demonstrates proficiency in hand-to-hand combat against ordinary individuals, though ineffective against Qwasers. Her masochism grants high tolerance for physical pain, deriving pleasure rather than trauma from torture. She also possesses acting skills, successfully impersonating Miyuri Tsujidô during an infiltration mission.

A significant development occurs when Hana becomes the holder of the Magdalena of Thunder, gaining electrokinetic abilities. She demonstrates flight and the capacity to unleash powerful electrical charges. Following this, she undergoes training with Alexander Nikolaevich Hell to improve her capabilities and become a more effective partner to Katja.

Hana evolves from a school bully to a more complex figure. While initially cruel, she exhibits kindness and loyalty, particularly toward Katja, disliking seeing her in danger or injured. Differences exist between manga and anime portrayals of her sexuality: the manga implies pre-existing lolicon tendencies, while the anime depicts them awakening upon meeting Katja.