Kodomo no Jikan (2007)
Original title: こどものじかん
Kodomo no Jikan is a 2007 Japanese-language animation series. It stars Eri Kitamura, Yuri Amano and Yuichi Ishigami.
23-year-old school teacher Aoki Daisuke has a huge problem. One of his students, Kokonoe Rin, has proclaimed herself to be Daisuke-sensei's girlfriend and is now on the warpath to win him over or get him fired.