Akatsuki no Kyoushitsu

In a small town near the coast is where the young and beautiful Akatsuki Chiyoko works as a biology teacher. She is very knowledgeable about all the fields of science and not just in biology. Her kindness often leads to her influencing many people in the community and she helps them deal with the problems they are facing. From her students at school, to the guys with feelings for her and the old women living alone, Chiyoko becomes an integral part of their humble lives.

(Source: MangaHelpers)