---Kirisame House, Forest of Magic. The forest stopped the rays of the summer sun, and brought cool temperatures to the forest
in exchange for high humidity. The feasts, which had continue ever since the spring flower viewings, became less and less frequent. People thought the number of feasts that had occurred was just fine.
Marisa "I'm free. Don't they say it's good luck to go somewhere when you have free time? Also... oni, eh? They actually exist. I wonder if that's good luck or REALLY good luck."
Ending No.4 (Marisa Good Ending) ―― Congratulation!
Marisa "Wonder if it can become a potion ingredient, or if it has some sort of special ability. I dunno... they're rare. I'll try asking Kourin. ...'Oh, this isn't something special. I'll take care of it.' is what he'd say. Nah, I'll do some research on my own for now."
Marisa added a new entry to her research notes: Oni. Apart from some youkai, no one knew much about oni these days.
Marisa "Huh? Don't vaporize when I bring a sardine head near you. Hrm. I have an idea. Wait up. I'll go buy some beans."
The denizens of Gensokyo lived longer than humans. Because of that, there was no need to record knowledge. The Grimoire, which became a book, was not a book of knowledge, but rather, a magic item. Basically, humans couldn't increase their knowledge if they did research by themselves without asking youkai. Marisa understood that humans had an extremely low amount of knowledge about oni.
Ending No. 4 (Marisa Good Ending) -----Congratulations!