There's the last two pages of this doujin. I should've uploaded them as well, but a year ago I didn't actually know any Japanese and thought these were an (extremely short) afterword or something. In any case, sorry for not actually uploading them until just now.

Also, if anyone can make the red text a more creepy font style, that'd be great - I still have no idea how to do that.

Now i imagine that after this, a fight could happen (ulil is a fighting game afterall), between them, with Kokoro finally knowing more emotions, and Koishi... finally using ore of her newfound powers?... (but speaking of powers, i find it interesting that Sumi was basically the only one affected by both Koishi's mary-san ability, and Kokoro's split-mouth woman ability (even though she just "wanted" to kill people to just not bother with the "i am pretty" question which will just end on the victim's death, regardless the outcome), which makes me wonder... are humans in the outside world much more easily scared of mythology and urban legends than any avarege gensokyan folk? or maybe Sumi is actually much more easily to scare because she's basically a teenager, while most of the girls in gensokyo, despite looking fairly young, have a lot of years of history between them?... (if they have any history that is, mostly for the fairies... and specifically cirno))