Did you find Yocchan's quest? i searched for so long without finding anything, i would love to try it, the moon is the best faction with Makai and hell.
It was a RPGMaker game. I have it somewhere, I think. Maybe unrelated to that comic, though, Yocchan is apparently about Cthulhu or something. I'll see if I can find it again.
After some searching I found in the wiki listing a game called Imperishable Night Lunatic Moon Vignette (Yocchan Story) That lead me to some forum in french which lead me to theselinks I clicked them and they're safe. At least one of them has a download and the other seems to just have information, but maybe also has a download. They're both in japanese so I have no idea. If you know Japanese or feel like trying the download please tell me what you found