Hayami Kohinata is a junior high school student distinguished by waist-length+ straight black hair, typically arranged in twin tails with blunt bangs and a hime cut, violet eyes, a pale slim physique, and a height of 146 cm. She frequently wears school uniforms with ribbons, maid dresses, thigh-high stockings, garter belts, and knee-high boots, a limited wardrobe reflecting her impoverished situation. Her background is marked by trauma. Her family, formerly wealthy village doctors, charged exorbitant fees and denied treatment to those unable to pay, inciting a village revolt. This resulted in their home being burned, her parents forcibly expelled, and Hayami abandoned as an outcast. Consequently, she lives in extreme poverty, residing alone in abandoned trolley cars without basic utilities. She bathes in a nearby stream, cooks over open fires, and subsists mainly on foraged food or instant noodles. Collective village resentment fuels persistent bullying: peers derogatorily call her "cockroach," subject her to physical assaults like head-stomping and having toilet water dumped on her, and adults, including teachers, systemically neglect her by permitting the abuse. This ostracization shapes her initial antisocial, sharp-tongued, and vindictive personality. She rejects friendly overtures to shield others from similar treatment, internalizes guilt for her family's actions, accepts the bullying as justified punishment, and rarely defends herself. Before the revolt, she maintained a close friendship with Hotaru Kagura (later known as Hinata after assuming her deceased sister's identity), a relationship severed under pressure from Hotaru's family. Her development initiates when blind transfer student Takuma Hirose persistently reaches out despite social risks. Initially resistant, she gradually lowers her defenses due to Takuma's unwavering support challenging her self-imposed isolation. Key turning points include villagers burning her trolley home, leading her to move in with Takuma and his uncle, and her eventual reconciliation with Hotaru, facilitated by Takuma's mediation. Confronting her past reveals hidden vulnerabilities like an intense fear of spiders and avoidance of swimming due to poor aquatic skills. Later narrative arcs show her evolving from a passive victim to an active caregiver, particularly when Takuma suffers a mental breakdown after mistakenly believing her family caused his mother's suicide. She nurses him through his delusional state, where he confuses her with his deceased mother, ultimately aiding his emotional recovery and restoration of eyesight. Romantic feelings develop between them in the anime adaptation, culminating in a mutual relationship. Her character concludes transformed into a protective, emotionally resilient figure embodying perseverance and quiet strength, maintaining her core integrity amid the village's changing social dynamics.