Nasuno and Marimo are having coffee at a cafe. Nasuno says that she wants to have a part time job to broaden her horizons. Then, she start to work with Marimo, but Marimo has got fired from her part time job of a butadon restaurant.
Official site: http://te-kyu.com/
CD of the theme song: azB00VQRVU14
CD of Qunka!*: azB00VRAAP8O
BD of the fourth season: azB00VPHB1GY
You can read the original manga on web: http://comic-earthstar.jp/
*The theme song of the fifth season.
Episodes 37-48 are the fourth season. Niconico Channel of it is ch2606543 .
The next episode is #49. Episodes 49-60 are the fifth season.