Chizuru Yoshida is a high school student and the central figure of the story. She is depicted as exceptionally attractive and is fully aware of the power her looks grant her, allowing her to manipulate those around her with ease. Her personality is initially presented as cold and calculating; she is a compulsive liar who uses her intelligence to control situations and exploit the men who become infatuated with her. She leads a secret life as a model and has appeared in television commercials, defying school rules against student work and using this secret as a tool for leverage.

Chizuru’s primary motivation revolves around her own desires and a need for control, yet beneath this manipulative exterior lies a deep vulnerability and confusion about her own emotions. Despite her numerous sexual experiences with men, she has never genuinely been in love, approaching these relationships as a game where she holds all the power. This changes dramatically with the arrival of Azumi Yamada, a new transfer student who becomes her neighbor. Chizuru finds herself unexpectedly and powerfully attracted to Azumi, a shy and innocent girl who represents everything Chizuru is not. This attraction confuses and frightens her, forcing her to confront a part of her identity she had never explored, leading to a period of intense denial where she tries to convince herself that she could not possibly have feelings for another girl.

In the story, Chizuru serves as both the protagonist and the primary source of narrative tension. One part of the story is told from the perspective of a male professor who becomes obsessed with her, highlighting her ability to ensnare and torment others. However, the focus quickly shifts to her internal struggle as she transitions from a predatory figure to one who is emotionally vulnerable. Her role is defined by her toxic relationships with men, including a rockstar boyfriend named Hiroyuki, whom she lives with and uses to try to convince herself of her own heterosexuality. She also interacts with a younger student named Azumi, but the most crucial dynamic is the neighborly and romantic tension with Azumi Yamada. This relationship is the story's core, as Azumi becomes the first person who can make Chizuru's heart race and who reduces her to a state of shyness and panic, a stark contrast to her usual confident demeanor.

Chizuru undergoes significant development as she grapples with her burgeoning love for Azumi. She desperately tries to suppress her feelings, even having repeated sex with her boyfriend Hiroyuki in an attempt to reaffirm her lack of interest in women. This internal conflict peaks when she finds herself fantasizing about Azumi during intimate moments with Hiroyuki, forcing her to accept the truth of her emotions. Her journey is one of reluctant self-discovery, moving from a state of manipulative control to one of genuine, heartfelt longing. Ultimately, this development culminates in her decisive action to reject a marriage proposal from Hiroyuki, choosing instead to pursue a relationship with Azumi at any cost. Her notable abilities include her high intelligence, her skill at manipulation and lying, and her callous emotional detachment, which she uses to dominate her male suitors. However, her most significant ability is perhaps her own sexuality, which she wields as a tool, only to find it turned against her when she experiences true love for the first time.