Magika no Kenshi to Shoukan Maou

Briefly about Magika no Kenshi to Shoukan Maou manga: 

Exactly fifteen years as the world knows about magic and strange creatures from other universes.

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Today, people skillfully use them for their own purposes (to increase their influence). Already 7 states have contractual relations with these gods. By the age of 14, they had chosen paladins and magic wizards to use them as protection during the organisational events.