Worldview

'Gates' appear suddenly and randomly, spewing out countless types of monsters.

Monsters kill people and destroy buildings.

Gates

Classified as natural disasters because it is impossible to know when, where, or why they appear.

Before a gate forms, the mana wavelength in the nearby area amplifies. The wavelength strengthens according to the danger level. Danger levels are ranked S-A-B-C-D-E-F.

The strength of the monsters varies depending on the gate's danger level. Each gate has a boss monster, and the gate disappears only when the boss is eliminated.

To prevent these disasters, people called Guardians exist. A small number of people manifest mana, and those who do can become Guardians.

Monsters and Guardians are ranked by their mana capacity and other combat abilities.

Grades range from S-A-B-C-D-E-F in order of strength.

Guardian Academy

A place for training Guardians. Mostly consists of theory and training.

Dormitory facilities improve or worsen based on the assigned rank. As a rank rises, the dormitory quality improves.

Sparring sessions with familiars are held at the training grounds every two weeks.

Tournaments are held every three months, where masters and familiars compete together.

There is a tradition of summoning a familiar in the second year. Three opportunities are given; if all three fail, one can never summon a familiar again.

After summoning, the familiar's rank is measured by a crystal ball. If the crystal ball cannot handle the power, an error occurs... Since this is extremely rare, it is usually assumed the crystal ball is just old.

Rarely, beings from other dimensions are brought over. This is characterized more by rarity and unpredictability than a simple difference in strength.

Familiars are connected to their summoners through mana, and a contract is automatically formed upon summoning.

When a gate appears, Guardians change into combat suits and are deployed to the battlefield under the guidance of supervising professors.