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Kanako is a young woman who finds herself constantly frustrated by her older sister's unreasonable behavior. Her sister, a successful manga artist, seems to live by her own rules, often dragging Kanako into chaotic situations that blur the line between annoyance and affection. Despite the constant bickering, their bond remains strong, rooted in a shared history that makes their relationship both complicated and endearing.

As Kanako navigates her daily life, she encounters a series of increasingly absurd and intimate scenarios involving her sister and the people around them. From unexpected encounters to playful power struggles, each chapter reveals a new layer of their dynamic. The story explores themes of family, desire, and the fine line between love and frustration, all wrapped in a comedic and risqué package.