Feb 8, 2019
Anyone remember that booklet that came with one of the touhou magazines last year, previewing the next Grimoire of Marisa-eque book with Reimu and Sumireko and friends judging danmaku at a fireworks show? Well, Amazon is currently listing the title as "The Grimoire of Usami" with 25th March 2019 as the release date.
The seller listing it is amazon.jp itself, so it’s most likely legit, but obviously we won’t know for sure until ZUN or someone official announces it. Less than two months to go though!