TV-Series
Description
Hikari Tsukishiro is a central figure in the narrative, a mysterious and enigmatic girl who appears to know the deepest secrets of the city of Kazune. Physically, she is depicted as a pale, slim teenager with a notably short stature of 146 centimeters. She has short white or gray hair and distinctive red eyes, though in some adaptations, she loses this red coloration after a significant transformation. She is typically seen wearing the uniform of the north campus of the Kazune Academy, often accessorized with a beret and various ribbons, reflecting her quiet and reserved aesthetic.

Central to her character is a profound and ancient history that sets her apart from the other inhabitants of the city. Hikari has existed for over a thousand years, with her origins tracing back to a time when she served as a priestess in a small village. Her current state is the result of a tragic cycle tied to the protection of Kazune City itself. As the citys administrator, her power is directly linked to the citys spiritual strength. Hikari was forced to perform the Doukatai ritual, a process that perpetuates a cycle of death and renewal to protect the town from a curse. This ritual involved confronting her brother, the orchestrator of the original conflict, and ultimately taking his place, binding her to centuries of loneliness and the burden of repeatedly killing.

In terms of personality, Hikari is initially defined by her distance and emotional inaccessibility. She is intensely reserved, quiet, and appears to lack visible emotion, which gives her a cold and cynical demeanor. This behavior stems from a deep-seated low self-esteem and a profound fear of rejection, a direct consequence of her long, isolated existence. Despite this apparent apathy, she reveals an occasionally clumsy and awkward side, and beneath her detached exterior, she harbors a deep, unfulfilled longing for genuine human connection. She often speaks in a philosophical and cryptic manner, her words carrying a weight of hidden meaning that alludes to her vast knowledge and tragic past. Her daily life involves running a small杂货铺 (general store), a simple occupation that belies her extraordinary nature. A solitary figure, her only constant companion throughout her long journey is a black cat, underscoring her isolation before her fateful meeting with the protagonist, Makoto.

Her primary motivation shifts throughout the story, beginning as a resignation to her eternal duty and evolving into a desire for freedom. For centuries, her actions were driven by the necessity to protect the city of Kazune, even if that protection required immense personal sacrifice and the perpetuation of a violent cycle. She develops a focused interest in Makoto, seemingly because his hands-on, sincere nature contrasts sharply with her own distant, observational approach to life. Her role in the narrative is that of a keystone; the mystery of the city is inextricably linked to her own existence. Makotos relationship with Hikari is the key to breaking the ancient curse. Her storyline is often the most difficult to unlock or complete, typically requiring the resolution of other characters' arcs first. Her key relationships are defined by her bond with Makoto, who becomes the catalyst for her change. Other important figures from her past include her brother, the source of her initial trauma, and various historical incarnations of the townspeople who have been caught in the cycle over the centuries, including individuals who appear as her friends in the present day.

Hikaris character undergoes a dramatic and poignant development. When Makoto expresses a desire for universal happiness, it prompts a powerful confession from Hikari, but the overwhelming emotional release drives her to a desperate act, attempting suicide by leaping from a cliff, only to be saved by him. Inspired by his unwavering promise, she finally breaks the cycle by performing the ritual on herself. This act causes her to vanish, reborn as an ordinary girl named Aya Tsukishiro. In this new form, she loses her memories, her supernatural red eyes, and her immortality. She becomes a normal high school student, and all records and memories of her previous existence as Hikari fade from the world. In alternate endings, she is saved and marries Makoto, or is reborn as a child of the protagonist with another heroine.

Notably, Hikari possesses several extraordinary abilities befitting her ancient nature. Her most significant power is her immortal longevity and her role as the administrator of Kazune City, which grants her abilities tied to the citys life force. She is highly skilled in wielding a katana, a weapon she has likely used for centuries in her grim duty. Despite her ethereal nature, she also has practical, grounded talents including cooking and a passion for painting landscapes, particularly those depicting open skies, which may symbolize the freedom she lacks and desires. Her knowledge of the citys history and its supernatural mechanics is unparalleled, essentially making her omniscient regarding its secrets.