Anastasia is a character from the short-form anime series Chuhai Lips: Canned Flavor of Married Women, appearing as the central figure of its fourth episode. She is a woman of Russian heritage who is married to a tall Japanese man notable for his distinctive mohawk hairstyle. Her presence in the story is primarily established through her role as the older sister of a character named Yoshif, who is a friend of the series' protagonist, Tsuyoshi.

In terms of personality, Anastasia is depicted as an extraordinarily lively, outgoing, and striking individual. She is known for her hearty laughter and a direct, almost blunt, manner of speaking, which is further characterized by a relaxed Kansai dialect, creating a unique blend of her Russian background and her life in Japan. Her humor is often bold and can venture into risqué territory, yet she maintains an underlying warmth and reliability that makes her endearing rather than off-putting. She approaches life with full energy and possesses a confident, open-hearted demeanor that draws people to her.

Anastasia's role in the narrative is that of a catalyst for a key encounter with the main character, Tsuyoshi. She regularly visits her brother's apartment to check on him, and during one such visit, she and Tsuyoshi end up drinking canned chuhai together. After becoming heavily intoxicated, she mistakes Tsuyoshi for her own brother, which leads to a series of intimate and unexpected situations. This encounter evolves into a more extended liaison when she and Tsuyoshi take over her brother's place on a trip, spending a weekend together at a traditional hot springs inn, or onsen. Their relationship is characterized by a friendly, lighthearted, and almost sibling-like dynamic, despite its intensely physical nature.

Regarding key relationships, her bond with her brother Yoshif is the initial link to the story's main cast. Her most significant connection, however, is with Tsuyoshi. Their interactions are defined by a mix of playful teasing and passionate encounters. A notable example of her humor is her habit of playfully calling Tsuyoshi a pervert in Russian. While her husband is mentioned, he does not play an active role in her storyline within the anime's episodes.

In terms of development, Anastasia does not undergo a dramatic personal transformation but rather reveals different facets of her character through her actions. She is portrayed as a strong, reliable, and self-assured woman who is fully in control of her desires and choices. Her background as an experienced judo trainer, holding a black belt and running a youth judo school, underscores her physical capability and the sense of safety and reliability she projects. This strength is a consistent part of her identity, from her first appearance to her last.

Anastasia's most notable ability is her expertise in judo, where she is known for her incredible grappling techniques. This skill is a core part of her character, reflecting her physical strength and dependable nature. Beyond this, her defining traits are her vibrant social energy, her unapologetic directness, and her capacity to form a unique, carefree, and intimate bond with Tsuyoshi, making her a memorable figure within the series' anthology of stories.