Strange Recovery: I Have a Book of Mountains and Seas

Looking for a Book with a Weird World Background and a Book Like the Demon Suppressor! It's a Trick, Not a Ghost!

I would like to read a book similar to "Starting from the Palace: I Can See Hidden Messages". The background is the world of weird and distorted practice. The protagonist practices weird and distorted techniques in an organization such as the Demon Slayer Division.

Weird Fairy Cultivating Genre, Mastering a Certain Ability Comes with a Price, Requires a Long Story