Anon has a Marisa, and a Reimu that Marisa found outside and refreshed with. They already have some kids. When the newest one is born, Anon pretends the mecha Reimu is one of the kids that were born. The yukkuris take it in as family.
The mecha Reimu can be controlled by computer, and anon uses it to cause discord between the family members, spreading rumors of dad Marisa cheating with an Alice while out hunting. This makes mom Reimu attack Marisa, etc.
Anon puts Reimu in a cage to punish it for attacking Marisa.
Later when the kids are given sweets by Anon, he uses the mecha Reimu to talk the other kids into eating all of it including dad Marisa's share. Then when dad comes home he has the mecha Reimu "confess" to eating dad's sweets, and dad gets angriest at the Marisa that tried to lie its way out of it. Little Marisa gets beaten.
Later anon talks the little Marisa into shouting obsceneties about the dad, records it and plays it back later to make them think little Marisa is saying it right then. Marisa gets even more beaten, but runs away under the drawers where she finds a pushpin and severly wounds the Reimu child.
Marisa dad tries to get little Marisa out of there but breaks the dish in the process.
Later Anon uses the mecha Reimu to 'confess' to Anon about Marisa breaking the dish, and Anon throws it out of the house to its old home in a hole as 'punishment'. There it meets the family from Big Family series, apparently without Anon's knowledge.
Then he gets the mother Reimu out of its punishment cage and tells it to go gather food since Marisa's gone on a trip.
Summary: Screaming, Marisa is suddenly stopped by the sound of something breaking, and spots the broken dish. She initially questions why, thinking that she didn't do anything (so if they don't see... hmm, food for thought), but she knows that if Anon sees it, she'll be punished. She quickly cleans it up and buries the shards in the garden (pretty good thinking), not knowing that Anon is watching her through Mecha Reimu (if not for this).
Anon thought that Marisa was getting a bit better after becoming a parent, but all that talk of being able to discipline its children were lies, and that Marisa still needs disciplining. Meanwhile, Koreimu is wondering where she is, when she sees her elder sister, who had been taken by a Remirya. The dead elder sister tells Koreimu not to come closer, and leaves with Koreimu crying out for her not to go.