Moyako Konoe is a female high school student with black hair, standing 168 centimeters tall. She lives with her younger brother, Akira Konoe, running their household without parental guidance. Academically and athletically successful, she holds a popular and responsible position within her school, often viewed as a model student.

A defining trait originates from a childhood incident where Akira expressed a wish to marry her. This led Moyako to develop a persistent, profound misinterpretation of his intentions. She became firmly convinced he harbors inappropriate romantic and obsessive feelings towards her. Consequently, she believes her role is to "rehabilitate" him from these perceived tendencies.

The narrative establishes Akira's actions as typically innocent, with Moyako's perception of his "perversion" being entirely a product of her own imagination. She habitually constructs elaborate delusions, transforming mundane interactions with her brother into scenarios she interprets as sexually charged or part of his calculated effort to pursue an incestuous relationship. These misinterpretations frequently trigger intense internal monologues where she becomes completely absorbed, escalating into visible panic or aggression while temporarily oblivious to her surroundings.

Her fixation manifests as excessive protectiveness, suspicion of Akira's interactions with others, and interpreting his normal behavior through a distorted lens. She suspects her friend, Kasumi Kurose, of colluding with Akira due to Kasumi's awareness of Moyako's complex. Despite her delusions, she exhibits genuine care and kindness towards her brother, managing the household for his benefit. Her birthday is December 6th.