I Was a Bottom-Tier Bureaucrat for 1,500 Years, and the Demon King Made Me a Minister

Before Azusa met with the noble Beelzebub, how did this plain Zebub who lived inconspicuously becomes the agriculture minister?
Were you able to manage the Demon country ?
Spin off from Slime Taoshite 300-nen, Shiranai Uchi ni Level MAX ni Nattemashita