The protagonist Mitsuki is reincarnated into another world. There she ends up as a slave, but is then purchased by a beastman and begins her new life as a maid. Mitsuki is of the age that she is highly curious about her "nighttime duties." One day, she overhears one of her maid friends speaking about a certain topic of interest. "I never dreamt that a penis could do that. Not even in my wildest dreams..." It would seem that the genitalia of beastmen are different to that of humans----? On the other hand, Mitsuki's beastman master Berthold see her talking cheerfully with a human man... and while he maintains a calm and gentle outer composure, he is seething mad with jealousy...