Anon take a walk through the forest. Lately he's getting fatter.
Under a big tree, he saw a yukkuri nest hole with Marisa and Reimu pair. Just something you can see everywhere, he thought. Then he realized something wrong and returned to the pair.
Reimu asked what Mister Human want. Still surprised, he randomly asked why "Marisa" is hurt. Marisa is full of scar and patched with herbs, it make the human feel pained just by looking.
Reimu enthusiastically tell story of her husband, the hero of the clan. Marisa is daughter of a father Myon. From her early day, she has trained swordmanship under her father and finally surpass her father. Alone, she can drive away scum and even rapers.
But one night, a Flan attacked the clan. Running out of strategy, the chief Patchouli sent Marisa to fight the monster. Marisa beaten a Remirya before, but Flan is stronger and smarter.
Finally, Marisa returned with Flan's cap.
That happened last night.
Anon get an idea of the situation and kind of admired the Flan for coming home and sleep with the wife of the yukkuri she just killed.
Well, he's not obliged to tell Reimu who's the yukkuri laying next to her. He just leave and not look back.
Afternote, the author said it's summer, so he want to make a horror story. Something like a killer you thought is dead is actually hiding as one of your friends.