Birthday: October 26
Yui Hongo is the Priestess of Seiryuu. She is an intelligent and mature tenth-grade student, and Miaka Yūki's best friend. A passionate person at heart, she tends to view the world in black and white terms and gets easily infuriated by perceived betrayal. Despite her confidence and boldness, Yui longs for someone to take care of her. It was revealed in the manga that she cut her hair to avoid unwanted attention from boys.
Initially, Yui is transported to "The Universe of Four Gods" with Miaka but quickly returns to the real world and becomes the one who reads the book to advance events within the universe. However, while attempting to help Miaka return to the real world, Yui becomes trapped in the book herself. Bandits capture her and knock her unconscious. Upon regaining consciousness, she mistakenly believes she has been raped and, in despair, tries to kill herself. Nakago rescues her and convinces her that Miaka is responsible for her misfortunes, leaving Yui unaware that Nakago had saved her before the bandit incident and that no rape occurred. He manipulates Yui into becoming the Priestess of Seiryuu, convincing her it will allow her to exact revenge on Miaka. Eager for vengeance, she agrees and swears to fight Miaka and take away her lover, Tamahome, whom Yui has developed feelings for.
After successfully summoning Seiryuu, Yui uses her first wish to seal away Suzaku's powers, preventing the god from being summoned and the Celestial Warriors from using their abilities. Her second wish is to bring both herself and Miaka back to their world, hoping to separate Miaka from Tamahome. However, Tamahome also arrives in their world with them. Upon learning that Nakago had been manipulating her all along, Yui has a change of heart and redeems herself by using her third and final wish to disable the seal on Suzaku, allowing Miaka to summon it. Unfortunately, Yui is absorbed by Seiryuu afterward. After summoning Suzaku, Miaka used her first wish to rescue Yui, and they became friends again.
Following the events of "The Universe of Four Gods," Yui enters a long-term relationship with Tetsuya Kajiwara, a friend of Keisuke Yūki, who fell in love with her while following her journey through reading the book.
