(I'm bringing this blog update forward a couple of days because the Shitlord of Twitter himself, Dilbert Stark, has announced that during April he'll be stripping the blue ticks from verified but non-paying Twitter accounts like mine and drop us from being boosted by the all-powerful algorithm. So if I wait a couple of days longer, my tweet linking to this post will sink like a stone. To which all I have to say, "fuck you, Elon"—and if you wish to be notified in a timely manner of future blog updates, follow me on Mastodon where I am @cstross@wandering.shop.)
Escape from Yokai Land is a slim novella in the Laundry Files, published by Tor.com Publishing in the USA in March 2022. There is as yet no UK edition, but you can buy the hardcover or ebook as an import in the UK. As a special promotion, Tor.com are cutting the price of the ebook to $2.99 for the month of April—otherwise it's a somewhat steep $11.99. Here's Tor.com's landing page with links to where you can buy it.
As to the UK edition: I eventually intend to publish a Laundry Files short story collection in both the UK and USA, and Yokai will be included—but for commercial reasons, my US publisher is reluctant to release it until after the final Laundry Files novel, so it's not going to happen for a couple of years.