Jahy-sama wa Kujikenai! S01

When Jahi, the demonic king's assistant, was honored as the second demon of the realm; he ruled over his subjects with fear. However, when a magical girl attacks a sacred gem containing immense power and destroys it, the demon realm is destroyed. Although Jahi survives, he loses almost all his power and becomes trapped in the human world with a childlike appearance. To recover his original form and demonic powers, he must collect more sacred gems. Jahi must adapt to his new life and overcome the daily problems he has never experienced before, from working to pay for living expenses to arguing with his landlord whenever the rent is late; the great Jahi will not be disheartened!