Kodomo no Jikan
Daisuke is a 23 year-old new schoolteacher. He ends up being put in charge of a 3rd grade elementary school class since the previous teacher quit, and in that class there's a girl who's quite a troublemaker--Rin Kokonoe. You could call her a masegaki (used to describe a kid that acts more like an adult in some ways), and she's also part tsundere (though more dere than tsun).
manga
finished
2005
Chapters
Chapter 14
Chapter 13
Chapter 12
Chapter 11
Chapter 10
Chapter 9
Chapter 8
Chapter 7
Chapter 6
Chapter 5
Chapter 4
Chapter 3
Chapter 2
Chapter 1
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