Makai Ouritsu Youchien Himawari-gumi

Cocona has just fulfilled her dream of becoming a kindergarten teacher. But one day, she suddenly finds herself transported to the demon world! The Demon Lord asks her to take care of his son, the prince. The prince is only 3 years old, but he is very selfish and does whatever he wants. Cocona thinks if the prince spends time with a variety of children, he should grow up to be a less spoiled child. So Cocona decides to start a kindergarten in the demon world!

(Source: Alphapolis, translated)