Maruko appears as a secondary character in the anime series "Mahjong Hishouden: Naki no Ryuu," where she is the girlfriend of the main protagonist, Ryuazaki. She is known for her supportive nature and frequently encourages him during his professional mahjong matches.

She has a petite and cute appearance, with short brown hair and light brown eyes. Her personality is bubbly, cheerful, and optimistic. Maruko also shows strong determination, pursuing her goals with unwavering focus once set.

In the narrative, she serves as a significant source of emotional support and stability for Ryuazaki, standing by him during challenges and helping him overcome obstacles. While not central to the primary plot, her role adds emotional depth to the series by emphasizing the strength of Ryuazaki's personal relationships.