koishi komeiji's heart-throbbing adventure
Sentaku-bune's Niconico series, Koishi Komeiji's Heart-Throbbing Adventure (KKHTA).
Komeiji Koishi, an extra stage boss of Subterranean Animism, goes to upper Gensokyo to catch a fish for dinner, but she forgets to bring a fishing rod. Seeing the Scarlet Devil Mansion nearby, she decides to borrow one from them, and from there on Komeiji Koishi's Heart-Throbbing Adventure really begins...
As of now, only the final part has yet to release. However, given the creator’s sudden inactivity, *DON’T EXPECT IT TO COME OUT ANY TIME SOON.*
Not all creepy Koishi pictures count. Look for things such as sharp claws or the phrase, "My hat is my friend, it helps me relax."