Moemi Kanzaki is the younger sister of Sayaka Kanzaki. Following her parents' disappearance under circumstances that plunged the family into financial hardship, she resides with Sayaka. Moemi possesses light brown hair styled in a shoulder-length bob and cyan eyes. She stands 151 cm tall, with body measurements of 72-51-83 cm and an A-cup bust size. Her typical attire includes thigh-high stockings and spats, and she is depicted wearing a waitstaff uniform.

Curious about her sister's relationship and noticing behavioral shifts in Sayaka after Sayaka takes a job at a family restaurant, Moemi becomes suspicious of Sayaka's work activities and investigates. During one visit, her curiosity leads her to try on a revealing waitstaff uniform belonging to her sister. This act inadvertently exposes Moemi to the restaurant's exploitative environment.

Later, a man fired from the family restaurant deceives Moemi to gain entry into the Kanzaki home while she is alone. Despite her protests and pleas, he rapes her. This assault is orchestrated by Sayaka, who deliberately sends the man to target Moemi. In the aftermath of this trauma, Moemi is coerced into prostitution, mirroring her sister's situation. She is last seen wearing the same waitstaff uniform, now participating in the exploitative system that entrapped Sayaka.

Her story concludes with her forced involvement in the restaurant's illicit activities, completing her character arc from an innocent younger sister to a victim ensnared in sexual exploitation.