Yuuri Oreki

Serving as the homeroom teacher for Ikki and Stella, this instructor insists on the playful nickname "Yuri-chan" from her pupils. Despite her approachable demeanor, she battles a mysterious, debilitating illness that results in her coughing up massive amounts of blood daily. Her influential role in the story is significant, as she played a pivotal part in helping Ikki secure his admission into the prestigious Hagun Academy.