Chisato Mizusawa, 28, works as an assistant manager/supervisor at a PR company. She presents a reserved, calm, and professional demeanor at work, meticulously concealing her true self from colleagues. Originally from Nagano Prefecture, she studied abroad. Her career path was inspired by a high school encounter with the kind "Lemono" character mascot, leading to a hobby of collecting Lemono merchandise.

Standing 159 cm tall, she has brown hair usually in a ponytail and blue eyes. Due to significantly impaired vision (0.01), she wears glasses at work. Her appearance and behavior shift dramatically in private, especially after consuming alcohol. She unfastens her ponytail, removes her glasses, and becomes strikingly playful, affectionate, and expressive, often uttering "shifuku" (bliss). This contrast defines her.

She is married to Sora Mizusawa, a furniture designer and part-time bartender who handles most household chores, particularly cooking. Their relationship centers on his after-work cocktail preparation, which reliably triggers her transformation into a vulnerable, affectionate state. While alcohol easily makes her tipsy, she displays identical "drunken" behavior even with non-alcoholic drinks he prepares, indicating her responses stem from emotional trust and comfort with Sora, not solely biochemical effects. This aligns with the "yoidere" archetype she exemplifies, describing those who openly express suppressed affection only when intoxicated or receiving care from a specific person.

Beyond this dichotomy, Chisato is clumsy, unskilled at sports and household tasks, and relies on Sora for domestic management. Despite professional competence, she avoids social drinking at work to prevent her hidden traits from surfacing publicly.