Tetsujin 28-gou Gao! is a tV short anime that premiered in spring 2013.

About the production: the story comes from a manga, there are 151 episodes of about 5 minutes and its current status is "finished".

Its main genres are mecha and slice of life.

This series of anime shorts, roughly five minutes in length, will focus on protagonist Shoutarou Kaneda's everyday life instead of focusing on battle scenes as previous Tetsujin 28 titles have done. The visuals of the title robot, its nemesis Black Ox, and other elements will have a pop-art style. (Source: Anime News Network)

Official synopsis from AniList.