Anna was raised in an elite household where strict moral purity was not just expected but enforced. Her mother, Sophia Nishikinomiya, was a key architect of Japan’s extreme censorship laws, ensuring that Anna grew up shielded from all forms of indecency. As a result, Anna developed into the perfect role model of virtue, fully believing that sexuality, dirty jokes, and obscenity were corrupt evils that needed to be eradicated.

As the Student Council president, Anna takes her role extremely seriously, ensuring that Tokioka Academy remains a place of absolute moral purity. She recruits Tanukichi Okuma, her childhood friend and secret admirer, to aid in her mission to hunt down Blue Snow, whom she sees as the greatest threat to the school’s morality. However, her entire worldview is shattered when an accidental encounter with Tanukichi awakens suppressed desires within her, leading her to develop an uncontrollable obsession with him.

Unable to comprehend or control her newfound emotions, Anna’s once righteous nature twists into something far more unhinged, making her one of the most terrifying yet comical figures in the series.

Anna has long, silver-white hair and striking red eyes, giving her an elegant and refined appearance. As the Student Council president, she maintains a flawless and composed demeanor, embodying the ideal image of purity and grace. She wears the standard Tokioka Academy uniform, consisting of a blue blazer, white dress shirt, and dark skirt, always neatly arranged to reflect her strict discipline.

However, as her obsession with Tanukichi escalates, Anna’s appearance begins to shift in subtle yet unsettling ways. Her expressions grow wilder, her eyes often appear crazed, and she displays unsettling levels of physical aggression, reflecting her gradual descent into obsessive madness.

At the start of the series, Anna is a strict, disciplined, and highly moral individual, embodying absolute purity and virtue as the president of the Student Council. She is deeply devoted to upholding the country’s censorship laws, believing that lewdness and obscenity are absolute evils that must be eradicated. She approaches her duty with unwavering conviction, showing zero tolerance for indecency, and expects others to follow her strict moral code. Due to her upbringing under the influence of her mother, Sophia Nishikinomiya, Anna is completely ignorant of romantic and sexual feelings, making her one of the most naive characters in the series before her eventual transformation.

However, after experiencing her first romantic awakening, Anna’s personality undergoes a complete and extreme shift. Once her desires for Tanukichi surface, she becomes obsessive, possessive, and completely unhinged, unable to control her emotions or impulses. Her former grace and self-control collapse, giving way to irrational, unpredictable, and often terrifying behavior. Despite her increasingly aggressive and inappropriate actions, she remains convinced that everything she does is pure, showing a complete disconnect between her actions and her perception of morality. This contradiction makes her one of the most hilariously terrifying characters in the series, as she continues to pursue Tanukichi in increasingly extreme ways, while still seeing herself as a paragon of virtue.

• The Model of Purity
  At the beginning of the series, Anna serves as the perfect enforcer of Japan’s morality laws, making her a direct threat to SOX. She assigns Tanukichi the task of hunting down Blue Snow, believing that his supposed commitment to moral purity will aid in SOX’s destruction.

• Her Romantic Awakening & Descent into Madness
  Anna’s story takes a drastic turn after an accidental encounter with Tanukichi, triggering her first real experience with romantic and physical attraction. This event completely shatters her composed persona, sending her into a downward spiral of obsessive behavior and uncontrollable desires.

• Conflicted Yet Dangerous
  Despite her newfound obsession, Anna never abandons her belief in moral purity, creating a bizarre contradiction in her actions. While she continues to hunt down Blue Snow and oppose SOX, she also develops an irrational belief that Tanukichi belongs to her, leading to a series of bizarre, inappropriate, and often aggressive attempts to claim him as her own.

• Final Confrontation & Self-Discovery
  As the series progresses, Anna’s increasing instability makes her both a threat and a source of dark humor. Her arc becomes a chaotic mix of unfiltered obsession, misplaced righteousness, and comedic horror, ensuring that she remains one of the most unforgettable characters in the series.