Inumarudashi

Inumarudashi (いぬまるだしっ, Inumarudashii) is a manga by Kōji Ohishi, serialized in Shōnen Jump since 2008. An anime has aired in the summer of 2011.

Story
Yamada Takamo has always wanted to be a kindergarten teacher, but when she has her first day she meets Inu-kun. Inu is a super problem child who to top all things, refuses to wear pants or underwear. How will she manage her new kindergarten career?