Specially Chosen Yukkuri
Story starts with a Marisa-Reimu family getting fed, they complain about how there isn't enough food, but the man ignores them and they just go to sleep.
When they wake up, they find themselves in a new room, and another human tells them this is now their home. He tells them that they're now his yukkuri, leading them to conclude that they're pet yukkuri and therefore can take it easy as they're the special chosen ones.
Anon arranges a trade, they answer his questions, he'll give them a sweet for each one. If they can't, he'll punish them. Of course, they quickly forget about the latter. The first question is easy: Are you taking it easy?
Encouraged by their initial success, the family can't wait to answer some more. The next question: How do you take it easy? Marisa thinks hard, but can only answer that easy is easy. Immediately she gets hit, and when they object, Anon reminds them of the punishment clause.
Question after question is asked, and they can't answer ANY of them. (e.g. What would you do if your little one's eyes get ripped out? Ans: Can't take it easy without mister ey- <Didn't ask about that! *Slap*>) And eventually the Marisa breaks down and dies.
When the family asks why is this happening to them when they're chosen yukkuris, Anon starts laughing. They get angry, but he eventually tells them the truth. They're trash that couldn't get sold at the pet store even after price lowering. Reimu claims she can sing, but Anon points out that any yukkuri could, and even if she was better than them, she never sung for anyone other than her family. They can't learn like Patchouli, can't look cute like Alice, can't be energetic like Chen.
Reimu says she's cute and energetic, and Anon adds that its with comparison to other yukkuris. They were doing their best to sell themselves while Reimu and her family slept, and got their badges, while her family was the only one not sold, not CHOSEN.
Then Anon tells them that if they hadn't been picked by him, they would've become food for Remilias, and finally confesses that he's an abyuser of idiots like them. And the reason he's been trolling them with questions is so that he can think up more ways to abuse them.
They eventually break down and beg for their lives, and he asks them one final question: Refreshing, doing pee-pee, and doing poo-poo, which one do you like the best?
Koreimu says pee-pee, Komarisa says poo-poo...
Koreimu gets fed sweet water, and when she says she needs to pee-pee, Anon puts her aside and forces her to drink, making her swell up. She explodes in the end.
The Komarisa gets her mouth stopped up and squeezed, and eventually dies by expulsion of too much paste through her anyaru.
When Reimu mourns her dead children, Anon offers to help her make some more. She treats the corpses pretty uncaringly after that. After a long time, he comes back and puts a raper on her, using a growth formula to help the kos grow quickly.
I can't really comprehend this part, but it seems that he put some dish filled with liquid under the kos, and they fall in and melt away. Some turn black and die after being born, maybe because of the growth formula.
Reimu demands to know why Anon never helped, since she's a pitiful single mother. He replies he'd only help her have kos, but not afterwards. More and more kos get born, despite Reimu telling them not to, and they subsequently die seeing their mother not helping them. Apparently her feet have been immobilized (not sure how, must've missed it). She dies in the end.
There's a short part about how Reimu's life was without hardship after she was born. Refusing to listen to humans and study, laughing at yukkuris who did, finally hooking up with Marisa and making children, but dying in a cramped box surrounded by the paste of her dead children without knowing why.