Description
Ai-chan is a second-year high school student, 149 cm tall and weighing 50 kg. She has brown hair styled in a bob cut with two braided strands behind her ears. Her curvy figure, particularly her large bust size, draws persistent attention and shapes her interactions. Starting at an I-cup (97 cm), her bust measurements grow across the series: first to 100 cm (J-cup), then K-cup, later 101 cm, and finally 103 cm. This continuous growth contrasts with her unchanging height, fueling self-consciousness about her body.
At school, she displays a reserved, introverted personality, often reading alone or rejecting confessions due to unwanted attention. Rumors and peer jealousy hinder genuine friendships. Yet with trusted individuals like the Salaryman ("Onii-san"), she reveals a playful, mischievous side—teasing him openly and expressing a wide emotional range. These interactions bolster her confidence, though she retains complex feelings about her physique.
Her bond with the Salaryman begins during a crowded train commute: squeezed against him, he drops his business card on her, and she returns it. An accidental fall during this encounter hospitalizes him, leading to a recurring Monday ritual where he shields her from crowds as her "bodyguard." She gifts him buttons popped from her shirts by her bust size, symbolizing their connection. She confides secrets, like her unauthorized part-time job at Bakery Restaurant Tawawa, where her uniform strains against her figure.
She lives with her mother and a younger sister who shares similar physical traits. Her mother frequently mends clothing damaged by their figures. Her protective best friend, Volley-bu-chan, teases her about her appearance. Later, she expresses aspirations to study nursing.
Across adaptations, her relationship with the Salaryman varies: some imply sexual activity, while the manga emphasizes her initial embarrassment and gradual comfort with intimacy. She grows more assertive in teasing him—inviting him to adjust her clothes or visit her workplace—but remains guarded about topics like her romantic history.
At school, she displays a reserved, introverted personality, often reading alone or rejecting confessions due to unwanted attention. Rumors and peer jealousy hinder genuine friendships. Yet with trusted individuals like the Salaryman ("Onii-san"), she reveals a playful, mischievous side—teasing him openly and expressing a wide emotional range. These interactions bolster her confidence, though she retains complex feelings about her physique.
Her bond with the Salaryman begins during a crowded train commute: squeezed against him, he drops his business card on her, and she returns it. An accidental fall during this encounter hospitalizes him, leading to a recurring Monday ritual where he shields her from crowds as her "bodyguard." She gifts him buttons popped from her shirts by her bust size, symbolizing their connection. She confides secrets, like her unauthorized part-time job at Bakery Restaurant Tawawa, where her uniform strains against her figure.
She lives with her mother and a younger sister who shares similar physical traits. Her mother frequently mends clothing damaged by their figures. Her protective best friend, Volley-bu-chan, teases her about her appearance. Later, she expresses aspirations to study nursing.
Across adaptations, her relationship with the Salaryman varies: some imply sexual activity, while the manga emphasizes her initial embarrassment and gradual comfort with intimacy. She grows more assertive in teasing him—inviting him to adjust her clothes or visit her workplace—but remains guarded about topics like her romantic history.