Momoka Fujimiya is a student with light brown hair and violet eyes, standing 1.47 meters tall and weighing 38 kilograms, with body measurements of 71-54-74 and blood type B. Her morning commute to school is frequently disrupted by three young boys who lift her skirt to reveal her underwear, which bears a distinctive bear face design. The boys tease her for the childish pattern, which they deem not age-appropriate, though she personally states that she likes her underwear. The boldness of their pranks causes her significant embarrassment, which becomes particularly heightened when a boy named Hiro Aida witnesses one such incident. His presence intensifies her humiliation, causing her to blush deeply and quickly leave the scene. Despite her outward frustration and animated gesturing towards the boys, her fundamental nature is kind and nice, and she is not capable of staying truly angry with them.