Ruriko employs a teasing, confident gyaru persona while working as a beer vendor at a professional baseball stadium, using this professional facade to attract customers and boost sales. This outward performance sharply contrasts with her true nature, which is innately innocent, kind-hearted, and pure; she consciously maintains this duality for her job. Her primary interactions revolve around Kotaro Murata, an office worker visiting the stadium to alleviate work stress. She singles him out as her first regular customer, initiating an ongoing dynamic with playful remarks like "Am I your type, Onii-san~?" and consistently teasing him during games. Over time, Murata gradually perceives the genuine warmth underlying her projected demeanor.

Ruriko navigates job challenges like encountering "triple-three sleaze balls"—customers seeking personal details. She firmly rebuffs inappropriate advances but naively accepts their help creating a social media account, an action that unexpectedly leads to viral online attention. Beyond sales, moments reveal her authentic kindness, such as assisting a lost child named Miku by escorting her to stadium security staff. Coworker gossip about romance triggers self-consciousness regarding her own lack of customer romantic attention. Despite her stadium environment, her grasp of baseball rules remains limited.

She wears the standard beer vendor uniform during work. Her character development focuses on sustaining her professional persona while allowing her true, compassionate self to surface through interactions with Murata and others at the ballpark.