The cat's rules

Cats have secrets.
Being able to walk on two legs, and being able to speak human language normally.
And when it comes out to humans, terrible things happen...
Fearing such a legend, the cats made a "rule" and obeyed it.
Three cats, Hoshi, Fuu, and Yuki, who live in a certain countryside, live a leisurely and happy life with a woman while following the rules.
But one day the woman falls and hits her head.
The cats break the rules to protect their peaceful days with the woman...!