Kiichi-kun teaches at a demon children's kindergarten in hell, preparing young demons for their future mission of human world domination. This kindergarten operates as a training ground where mischievous demon toddlers acquire essential skills and knowledge under his guidance. His daily interactions occur with demon students and colleagues, confined to the indoor and outdoor environments of the school. During certain comedic scenarios, he recurrently finds himself set on fire. He navigates the challenges of instructing demonic pupils while advancing the institution's core objective of world conquest training.