Yui Kouriyama

Hairstyle

Yui Kouriyama keeps her hair neatly styled, reflecting her orderly personality as a working office lady in her 30s. Her appearance is often described as mature and confident, matching her strong-willed demeanor.

Fashion

She typically dresses in smart, professional outfits, suitable for an office environment. When off-duty, she switches to more casual attire, and is frequently seen carrying a tote bag that conceals personal items.

Accessories

A notable accessory is her tote bag, which Yui uses for both daily necessities and secret items, such as a box of condoms she always carries when visiting her nephew’s apartment.

Strong-Willed and Confident

Yui is fiercely strong-willed and often acts in a bold, assertive manner, unafraid to speak her mind or take action.

Playful and Flirtatious

Alcohol reveals her playful and even provocative side—she becomes uninhibited, flirtatious, and sometimes teasingly inappropriate in her speech and actions.

Responsible Adult

Despite her impulsive tendencies, Yui is keenly aware of her responsibilities as an adult, frequently reminding her nephew to be safe and taking preventive actions herself.

Contradictory

She oscillates between affection for her gentle husband and irresistible attraction to forbidden excitement, struggling with self-control and emotional conflict.

Family

Yui is married to Tsuyoshi’s maternal uncle, making her Tsuyoshi’s aunt by marriage. She has built a stable life through her corporate career, supporting both her husband and, at times, her extended family.

Marital Life

Though her relationship with her husband is loving and harmonious, it's also highlighted that her husband's gentle nature contrasts with her own wild passions.

Caring Relative

Yui is entrusted by Tsuyoshi’s mother to check up on his independent life, which sets the stage for their recurring interactions.

Social Adaptability

Yui navigates both professional and family environments with ease, demonstrating excellent communication skills and emotional intelligence.

Alcohol Tolerance (and Weakness)

She enjoys drinking canned chuhai and, while she handles her drinks reasonably well, alcohol is also her biggest weakness—lowering her inhibitions and triggering her unpredictable, seductive side.

Tsuyoshi (Nephew)

Yui’s relationship with Tsuyoshi is complex, blurring familial boundaries. What starts as a casual visit turns into an affair marked by passion and guilt. She is both a mentor-like guardian and an eager participant in their secret, illicit bond.

Husband

Yui cares for her husband and values their marriage. Despite the affair, she maintains a good relationship with him, and he is even aware of her visits to Tsuyoshi’s apartment for drinks—though his knowledge of the deeper truth remains hidden.

Tsuyoshi’s Mother (Sister-in-law)

Tsuyoshi’s mother relies on Yui to keep an eye on her son, trusting her to be responsible and attentive.

Yui is the most frequently featured character in the series, with the largest number of appearances.

She is famed for using "strong can chu-hai" as a secret code—if she drinks it in front of Tsuyoshi, it signals it’s fine to engage in intimacy.

The first volume of the official comic collection is entirely dedicated to her stories.

Yui is the first woman to allow Tsuyoshi to experience deeply passionate intimacy, guiding him into adulthood.

"If I drink this strong can, you know what it means, right?"

"We must always take responsibility as adults, no matter what."

"I can’t help but crave the wildness you bring out in me."

Early Encounters

Yui is tasked by Tsuyoshi’s mother to check on him. During her visits, casual drinks escalate, and their mutual attraction comes to the surface, culminating in an impulsive but unforgettable night—an incident they initially try to dismiss as a drunken mistake.

Ongoing Affair

Despite her attempts to end things, Yui continues to visit Tsuyoshi, drawn in by the forbidden thrill. Their relationship deepens as she openly acknowledges her unique satisfaction from his passion, unmatched by her married life.

Moral Struggle

Yui constantly battles guilt, attempting to rationalize her actions as one-off mistakes while simultaneously enabling the secret affair with signals and hidden preparations, like bringing condoms in her bag.

Continued Popularity

With each appearance, Yui’s stories become fan-favorites, celebrated for their blend of humor, emotional depth, and daring taboo.

Yui’s storyline blends mature themes with humor, making her one of the most complex and beloved female characters in "Chuhai Lips: Canned Flavor of Married Women."

She encapsulates the tensions between responsible adulthood, familial duty, and the intoxicating lure of living on the edge.