Manga by author Zun - Status ongoing

Continuing in the Touhou series, this one follows the footsteps of Silent Sinner in Blue, Inaba of the Moon & Inaba of the Earth, and the Sangetsusei trilogy. This time, Marisa comes across a mysterious hermit outside the Human Village. However, as she tells Reimu about her, the hermit is seen sneaking around the Hakurei Shrine. She's Ibara Kasen, a strange, bandaged ascetic of unknown nature and ability who's far more aware of them and Gensoukyou than either realizes.

Marisa Kirisame runs into Hieda no Akyuu on her way through the Human Village, and notices that she's carrying a strange book - a youma book, said to be indecipherable. Afterwards she makes her way to the Hakurei Shrine to ask Reimu Hakurei about them, but she doesn't know much on the subject. Marisa explains their dark and mysterious nature, and the two decide to take a visit to Suzunaan to talk to Kosuzu Motoori about it. She reveals her collection of demon books, as well as her recently-awakened powers that allow her to decipher any sort of script. Reimu worries that it might be dangerous, but Kosuzu is not very concerned.

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The first official Touhou webcomic written by ZUN and drawn by newcomer Ginmokusei, featuring Satori Komeiji as the master armchair detective from the depths of the Earth.The first issue is currently free to read on the official Touhou web blog: https://touhougarakuta.com/comic/touhouchireikiden_1/