Onee-chan ga Kita is a tV short anime that premiered in winter 2014, produced by C2C.

About the production: the story comes from a manga, there are 12 episodes of about 3 minutes and its current status is "finished".

Its main genres are comedy and romance, with themes such as Inseki, Family Life and Seinen.

On AniList, Onee-chan ga Kita has an average score of 60%, an average score, and appears on 30,185 users' lists.

The franchise continues in or follows from: Onee-chan ga Kita: Hajimete no… Kitaa!.

The story revolves around Tomoya Mizuhara, a 13-year-old boy who suddenly gains a big sister when his father remarries. 17-year-old Ichika is a little strange, and her affection for Tomoya is rather overwhelming, if not scary. On top of things, Ichika's friend Ruri is the ultimate sadist. Then there is Ichika's big-breasted quarter-Japanese friend Marina. (Source: ANN)

Official synopsis from AniList.