Gosenzo-sama Banbanzai! is a oVA anime that premiered in summer 1989, produced by Studio Pierrot.

About the production: the story comes from an original script, there are 6 episodes of about 30 minutes and its current status is "finished".

Its main genres are comedy and sci-fi, with themes such as Family Life, Acting, Satire and Meta.

On AniList, Gosenzo-sama Banbanzai! has an average score of 73%, a good score, and appears on 6,190 users' lists.

The Yomota family is small and typical: father Kinekuni (42), mother Tamiko (38), and son Inumaru (17). One day, a beautiful girl appears at their front door, calling herself "Maroko Yomota," granddaughter of Inumaru who travels back in time with a time machine to visit her ancestors. Even with Tamiko's strong objection, Kinekuni and Inumaru welcome her to stay with them, and the structure of a happy family has begun to collapse. (Source: Anime News Network)

Official synopsis from AniList.