Hiyori is an ordinary middle school girl in her third year (9th grade), and a high school first year (10th grade) starting from chapter 25 of the manga. After saving Yato from a car accident, she develops the problem of involuntarily falling asleep suddenly due to her soul 'slipping out' of her body and somehow becoming stuck between the human world and the afterlife. Hiyori becomes more involved in Yato's activities and events in the 'far side'. During this time, she develops a strong attachment to Yato, being able to recognize him by scent and feeling embarrassed by how much she likes it. Despite it being her best chance to return to normal, Hiyori refuses to have her bond to Yato cut because she wants to spend more time with him. She even promises to never forget about Yato, and builds him a small shrine. Even when she gradually forgets about Yato's existence due to Yato's prolonged absence and her school life, she continues to feel empty and that she is missing the one she wants to spend her time with. Although overjoyed upon remembering about Yato, she feels guilt about forgetting about him even a little bit. In the anime, she lost her memories of Yato and Yukine after being attacked by Nora and the ayakashi Nora summons on New Years Eve. She later was able to recover all her memories by recognizing Yato's smell.