Obatarian.

オバタリアン

Obatarian (Japanese: オバタリアン) is a yonkoma manga series by Katsuhiko Hotta. It was serialized in Manga Life, Manga Life Original, and Really Happened Pleasant Stories (all published by Takeshobo) from 1988 to 1998, with a total of 13 volumes released by the publisher (with some reprints after 2000). A one-off anime television special was produced by Sunrise and aired on TV Asahi on April 3, 1990.