Mystical Prince Yoshida-kun!

Tired of his eternal reign over the Demon World, King Dark Fleet decides to step down and names an unlikely successor: a boy named Yoshida. News of this decision sends the demon realm into an uproar, as they discover their new sovereign is nothing more than a human child. Determined to claim the throne for themselves, a host of adorable demons begin slipping into the human world through a magical mirror, hell-bent on eliminating Yoshida. Unaware that he has been chosen as the next demon king, the young boy must rely on his meager magical abilities to defend both himself and his friend Ageha from the relentless onslaught.