Youkai are specters who have lived in the human world since the dawn of time. They often rest peacefully in their dwelling places, until humans rouse them by inconsiderate actions. Kitaro is a young youkai boy who wants to help humans and youkai live in harmony, and he fights to protect humans from the enraged youkai who lash out at them.

The English translation here is passed on the completed 46 volume collected version. For reference: https://gegegenokitaro.fandom.com/wiki/The_Complete_Kitar%C5%8D_Collection

Volumes 4-5 have been published in English in Kitaro (2013)
The other 7 collections collect some of the chapters translated here.
-That's why Hokuto no Gun and Happyscan! chapters aren't here.