Rats: destruction, plague, famine, greed, endless experiments, the end of life.
Rats: warmth, happiness, cuteness, an ideal paradise.
A black rat from another world and a white rat filled with hope begin their daily life, adventures, and bonds beneath the blue sky, watched by a crowd of rats.
"I'll leave the controls to you, White Rat!"
"You got it, Black Rat!"
(This story isn't dark, at least the main text isn't.)
(Multiple heroines, with the Rat God as the main wife.)
(Of course I'm writing about rats in the Year of the Rat.)
(I refuse to believe KMR will mess up the characters.)