TV-Series
Description
Hiyori Asahina is a young girl who serves as a central figure in the tragic time loop central to Mekakucity Actors. Born on March 3rd, she is eleven years old and physically small for her age, standing 138 centimeters tall. She has long black hair typically styled into two ponytails resting on her shoulders, with messy bangs and dark brown eyes. Coming from a wealthy family in the countryside, she was raised with lessons in ballet and piano from a young age.

On the surface, Hiyori presents a sharp, bossy, and demanding personality. She has a very active and stubborn nature, which drives her to take action on her desires without much hesitation. She is popular among her classmates, but she shows little interest in this attention or in romantic matters, often responding to those who approach her with a harsh tongue. This behavior is most visible in her interactions with her classmate and friend, Hibiya Amamiya, whom she orders around like a servant, makes carry her luggage, and constantly insults. She can be careless and messy, once leaving her trash around her brother-in-law's home without a second thought.

However, this cold exterior hides a more caring interior. Despite her constant put-downs, Hiyori genuinely considers Hibiya her only true friend, and within the time loop, she makes desperate efforts to save him from dying. In the eighth novel, she confesses her love to him and asks him to save her the next time. With people she admires, such as the idol Momo Kisaragi or the gentle young man Konoha, she drops her cynical attitude entirely and reveals a sweet, excitable, even protective side that is more age-appropriate. She is an enormous fan of Momo, to the point that a promise of receiving her autograph is enough motivation to take a trip to the city.

Hiyori's role in the story is intrinsically tied to tragedy. She travels to the city for summer vacation with Hibiya, staying at the home of her brother-in-law, Kenjirou Tateyama. She has a distant family connection; she is the younger sister of Ayaka Tateyama, though the two never met because Ayaka had run away from home long before Hiyori was born. On August 15th, she is hit by a truck while chasing a cat, an accident that drags both her and Hibiya into the Kagerou Daze, a supernatural heat haze. Inside this dimension, the pair is trapped in a endless time loop where, on each iteration of that same day, one of them must die to allow the other to escape.

Hiyori possesses a unique eye ability, though the nature of this power varies by adaptation. In the anime, Mekakucity Actors, she becomes the host of the Snake of Clearing Eyes, which functions as a surrogate life force that allows her to be resurrected from the Kagerou Daze. In the manga, she is given the Snake of Focusing Eyes, an ability that grants her an aerial clairvoyance, allowing her to perceive distant locations and people and even estimate when they will arrive. Throughout the story, her relationship with Hibiya develops from being merely a "convenient classmate" to someone she truly relies on, while her crush on the kind and strong Konoha represents her appreciation for those different from the people she knows back home.