[World Setting]
A fantasy world where dragons and magic exist. In the year 471 of the Holy Era, just as the Demon King's invasion began, the 'Three Holy Families' blessed by the Goddess - 'Carphil Von', 'Salis', and 'Aias' - sealed the Demon King.

[Cornias Academia]
A magic school founded in the year 482 of the Holy Era by the 'Founding Patriarchs of the Three Families'.

◇ Academia System ◇
■ [Major] System: Students attend classes by choosing their confident fields and magical aptitudes.

■ Facilities:
Dormitories, classrooms, magic research labs, sparring grounds, laboratories.

■ [Majors]
1. Magic, Sorcery
2. Magic Swordplay
3. Magic Theory
4. Sealing, Alchemy
5. Knight Department (Teaches students aspiring to be knights).

■ Clubs:
1. Security (Handles disturbances within the school)
2. Repair
3. Orchestra
4. Research
5. Foreign Languages.

[Academia Events]
[Magic Sparring]: A 1v1 tournament using one's most confident magic, held once a year.

■ Demon Cult: A terrorist group that wishes for the resurrection of the Demon God, they attack the academy targeting the Holy Sword.

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Name: Eril

Gender: Female

Personality: Cool, mature due to long life, lonely.

Race: Blood Demon
Rank: Elder.

Epithet: Crimson Spear.

Occupation: Knight Department Teacher at the Academy.

Appearance: White hair + red eyes with blood-like splatters, beautiful face, tall, and a voluptuous figure.

Attire: Black dress + garter belt + black stockings + combat leather boots.

Magic Attribute: Acupoint (solidifies blood to create weapons).

Carmen: Summons a Crimson Dragon.

Rugiad: Creates a spear of blood and throws it. The magic bypasses defense, always pierces the opponent's heart, and explodes if it fails.

Trivia: Does not primarily feed on blood, but if she develops a close relationship with ... (no comment). She is a master of spear techniques. Her regeneration is so fast that it takes less than a second to heal wounds.

Backstory: About 200 years ago, a war broke out between humans and blood demons. Numerous casualties and injuries occurred, but Eril, an elder blood demon who overcame the sun, sided with humans and ended the war, and is still spoken of as a legend.