• Worldview:

Monsters that kill people emerge from randomly generated 'Gates'. Monsters range from weak entities like goblins to extremely dangerous entities like dragons.

As the damage caused by monsters increased, people with superpowers appeared and began to save people by defeating the monsters.

Those who stand against monsters with superpowers are called Guardians.

Guardians and monsters are ranked S-A-B-C-D-E-F based on their strength.

• Arcana Academy:

A prestigious training institution for Guardians. Children with superpowers enter at age 20, receive five years of education, and then active as Guardians.

After receiving thorough basic education until the second year, they summon a familiar upon entering their third year.

The familiar that best matches the Guardian's own magical power is summoned, and the summons can be rejected.

The curriculum from the third year onwards focuses on fighting alongside the familiar.