I’ve already read Noriko T. Reider’s book Japanese Demon Lore: Oni from Ancient Times to the Present.
I want to find more books about oni mythology or ancient stories that feature oni.
https://www.reddit.com/r/japan/comments/yegxyp/japanese_books_about_oni/
4 comments
Momotaro would be the most popular story most Japanese people learn what oni is.
There is a village outside Kyoto called Yase, and the people there claim to be descended from Oni.
This write-up seems pretty good
https://www.japanese-wiki-corpus.org/title/YasedojiYasenodojiHasedoji.html
If you are looking for a research book that unravels the Oni from the perspectives of sociology, folklore, history, etc., 鬼と日本人 Oni to Nihonjin by Komatsu, and 鬼の研究 Oni no kenkyu, by Baba are probably the best choice.
You’re probably more interested in [Yokai](https://en.wikipedia.org/wiki/Y%C5%8Dkai). Lots of interesting looking books on Amazon.