Touhou - Until the Water Became Wholly Red

Synopsis

Youkai Mountain, Gensokyo. Even within this closed-off world, the tengu have their own closed-off, multilayered society. All Shameimaru Aya wants is to work on the scoop of a lifetime, but all around her, much more complicated schemes are afoot, and it seems they can't help but get in her way. Long-running doujin series by Ashiyama, author of "The Gensokyo of Humans" and "The Magician Who Loved a Fake". Published in book form and for free on Pixiv.