Since I don't have a lot of information on 'keiichirou ghost stories', it could be a personal project by Keiichirou where he writes about different types of ghosts. It might include elements like the characteristics of different ghosts, their motives, and how they interact with the living world. It could also potentially be a series of stories passed down in a particular family or community and Keiichirou is the one who has compiled them into what is now known as 'keiichirou ghost stories'.
I think it's worth watching. The voice acting and the way the story is presented in the dub make it an interesting watch. However, it's not a perfect adaptation and has its flaws.