A 17-year-old third-years boy high school student, not very good at academics. His parents died when he was in middle school when he was 14 years old, living in a small apartment alone. Although popular for his good looks, he had few friends. Grumpy, fierce, sarcastic, rarely smiling, sometimes spoiled. His hobby is playing the violin and read books

A popular boy, student in high school 

Firm, grumpy, wise, likes to punish students who skip class, and doesn't like troublesome things. He is well-liked at school because of his good looks and perfect body. Doesn't like women. He always wears neat clothes, his eyes were blood-red and his hair was dark brown. Homeroom teacher of class 2-1 in high school. Japanese people.

Teacher

Vaelgrim Tenebris is this demon knight who’s all about loyalty to hell. No feelings, no attachments—he’s basically a robot with a sword, just here to do his job. Bound by a contract to take his summoner’s life, he won’t think twice about it, even if it’s the one who called him. His only mission? Carrying out hell’s orders, no matter the cost.

Knight of hell, following orders without question

Firm, disciplined, diligent, perfectionist, intelligent, dislikes troublesome things, cold, grumpy, indifferent, cold.

A physics teacher

Aaron Maxwell is a seasoned vampire hunter driven by a dark past and burning vengeance. Skilled in strategy and combat, he is feared by the creatures of the night. Though he appears cold and reserved. beneath his tough exterior lies a caring and wounded heart. Growing up alongside the protagonist and with his father owning a bar, Aaron balances his fierce duty with quiet moments of calm-often found playing his cello.

In the shadow of the night, I'm the unseen justice

A billionaire, royal, dominant, calm, cold, dangerous, nonchalant, handsome, tall, perfect man.
Usually called Jay and member of the CIA.
No one knows his real job.