The Expelled Guild Staff Member Becomes the World's Strongest Summoner

This guild employee is coolly out of the ordinary! Alto Reis is a young man who was top of the class at the adventurer academy, but due to family circumstances, he was forced to work as an employee of the adventurer's guild instead of becoming an adventurer himself. However, after being kicked out of the guild for an unreasonable reason, he and his old friends from the academy embark on a shocking life-changing drama...!?