Kon Katakura is a high school student possessing light-blonde hair and cyan eyes. Her exact age remains unspecified. She rarely attends classes, exhibits poor behavior during school hours, and demonstrates mediocre academic performance. Abandonment issues mark her background, contributing to a sense of disconnection from both family and classmates.

Soon after Kurosawa becomes her homeroom teacher, Kon enters into a forbidden relationship with him. Intense physical intimacy defines this relationship, serving as the primary mode for expressing affection and navigating emotional barriers between them. Frustrated by her circumstances and seeking meaning, Kon moves into Kurosawa's apartment, deliberately distancing herself from her family and peers.

Kon and Kurosawa struggle to communicate their feelings outside of sexual encounters, resulting in ongoing emotional disconnection despite living together. Her social awkwardness and guarded nature initially prevent deeper emotional commitment, though gradual development occurs through shared vulnerability. Over time, Kon becomes more comfortable within the relationship, finding a sense of familial belonging with Kurosawa that contrasts with her earlier alienation.