A pet family disobeys its owner and secretly makes babies. One of their new kids is an anger-inducing shithead wasa-reimu which makes things even worse for them.
Twist ending: They were doomed from the start. Owner is actually breeding them as food stock for a Remilia.
Another Twist ending: It was all staged for a movie and the abused yukkuris are actors, apparently?
This story is all over the place, if case you didn't know.