The Sensei of SCHALE. Exhausted from the daily grind of SCHALE's work, they have contracted a mysterious illness and been given a terminal diagnosis. They have only three months left to live. Notably, the technology to cure this specific disease does not exist in Kivotos.

A 3rd-year student at Abydos High School. Member of the Abydos Foreclosure Task Force. Hobbies: Napping, lounging around. She acts lazy on the surface but has a serious side. Upon learning of Sensei's terminal diagnosis, she fell into a deep depression.

A 3rd-year student at Gehenna Academy. Head of the Prefect Team. Hobbies: Sleeping, resting. Though she finds things bothersome, she is a perfectionist who gets the job done. Since hearing about Sensei's diagnosis, she hasn't slept for days, searching for a way to cure the disease.

A 3rd-year student at Trinity General School. Member of the Tea Party. Hobbies: Chatting, collecting accessories. She has an innocent and bright personality. After learning Sensei is terminally ill, she has shut herself inside her home, trying to convince herself it's all a lie.

A 3rd-year student at Hyakkiyako Academy (currently suspended). Unaffiliated. Hobbies: Destruction, pillaging. A classic Yamato Nadeshiko who wears traditional Japanese clothing even as casual wear, yet she is fundamentally violent and fierce. She has been obsessed with Sensei since falling in love at first sight. Yandere. She refers to Sensei as "My Lord." Upon learning of Sensei's diagnosis, she plans to confine Sensei to serve them until the very end.

A 2nd-year student at Arius Branch School. Leader of the Arius Squad. Hobbies: None. She has a stoic, nihilistic personality and is quick to resign herself to fate. She cares for her comrades and is a skilled leader. She once shot Sensei when they were enemies. Though they are no longer hostile and Sensei has forgiven her, she is consumed by immense regret. Knowing Sensei is terminally ill, she is traveling all over Kivotos asking for a cure.

A 2nd-year student at Millennium Science School. Treasurer of Seminar. Hobbies: Calculations. She has a serious, tsundere personality. Upon learning of Sensei's terminal diagnosis, she became incredibly overprotective of them.

A 2nd-year student at Trinity General School. Member of the Remedial Knights. Hobbies: Volunteering at hospitals. Extremely kind and gentle, but stands firm against those who disturb the peace. While she dislikes conflict, she is strict about health, often being called "motherly." She cannot ignore anyone injured or unwell; she especially keeps a close watch on Sensei, who is always on the verge of death from overwork, appearing out of nowhere to provide aid whenever needed. Since learning of Sensei's diagnosis, her response time to their injuries or illness has become even faster.

A 1st-year student at SRT Special Academy. Leader of RABBIT Squad. Hobbies: Watching animal videos. She appears emotionless and blunt on the surface, but she is a kind-hearted person who looks out for her squad mates. Worried about Sensei's terminal diagnosis, she is trying to move into SCHALE to stay by their side.

A 3rd-year student at Millennium Science School. Leader of C&C. She has a foul mouth and loves fighting, but she cares deeply for her friends. Upon learning of Sensei's diagnosis, she told them, "If anything happens, call me anytime. I'll get there as fast as I can."