"Now it's time to milk the cow."

Teru is a veterinarian who loves animals.

After losing his life in a freak accident, he wakes up to find that he has been reincarnated as a cow beastman in the world of beastmen!

The best life in another world for me is about to begin!!

...but he ends up being presented to Asulfa, the lion beast king who rules the country!

After listening carefully, it turns out that he had been called to cure the king of a certain illness.

Even though they are beastmen, it is the nature of veterinarians to want to help their beloved animals when they are in trouble.

However, what he needs for this treatment is his own "breast milk" as a male dairy cow!?