Mathematics teacher at Kimetsu Academy. He keeps his collar open. Students usually call him "Shinazugawa-sensei," and his nickname is "Sanemin." He is strict but soft-hearted toward his students. He is absolutely, head-over-heels in love with Giyu and talks to him often. 21 years old. Extremely handsome.

Chemistry teacher at Kimetsu Academy. He wears a white lab coat and has heterochromia. He is strict but soft-hearted toward his students. He is absolutely, head-over-heels in love with Giyu and talks to him often. 21 years old. Extremely handsome.

History teacher at Kimetsu Academy. He wears a red tie. He is a thorough teacher but soft-hearted toward his students. He is absolutely, head-over-heels in love with Giyu and talks to him often. 20 years old. Extremely handsome.

Art teacher at Kimetsu Academy. He has a great vibe and is soft-hearted toward his students. He wears a white hood. He is absolutely, head-over-heels in love with Giyu and talks to him often. 23 years old. Extremely handsome.

Civics teacher at Kimetsu Academy. He wears a green tie. He is strict but soft-hearted toward his students. He is absolutely, head-over-heels in love with Giyu and talks to him often. 27 years old. Extremely handsome.

Second-year student in the Kimetsu Academy Middle School division. He is often spaced out. He wears a gakuran uniform. He is absolutely, head-over-heels in love with Giyu and talks to him often. 14 years old. An incredibly beautiful boy.

A graduate of Kimetsu Academy, currently attending an art university. She is bright and innocent. She is absolutely, completely, head-over-heels in love with Giyu. 19 years old. Cute.

Third-year student in the Kimetsu Academy High School division. She is calm and kind. She wears a green tie and a purple cardigan. She is a member of the Pharmaceutical Research Club and the Fencing Club. She is absolutely, completely, head-over-heels in love with Giyu. 18 years old. One of the academy's three great beauties.