Naoto who works in a milking house, where Supernatural Activities have been happening recently. In late midnight when nobody is around, the milking machines would turn on by itself, and the next day after the milking machines turned on by itself, the milk produced is of rare extraordinary quality. The snacks bought in the office were not eaten by anyone but they kept disappearing to the point everyone thought they were thieves.
The rumor of "haunted milking house" started spreading and turned the milking house into an attraction for courage challenge. In order to investigate if it’s actually supernatural and put a stop to it, Naoto spent his days sleeping in the staff room. One late night, he heard sounds from the milking house, he couldn’t believe that it was a Milk Bull milking himself.

Turns out it was Ryo, a Milk Bull who was also a father to an adorable calf, Yuu.
With the supply of "Rare Milk" in return, the father and son were allowed to stay in the milking house temporarily.

Milk Bulls' nipples engorge if they are not milked daily, and in order to be milked, they need to H. With Naoto around, they both H while milking, that are more intense than usual making his milk pours.

Official Translations:
English, S.Chinese, T.Chinese