After being reincarnated in another world, Mitsuki is bought by a beastman at a slave market and begins a new life as his maid.

Now at an age where curiosity about nighttime "duties" blooms, Mitsuki overhears something intriguing from a fellow maid: that she never expected her master's thing to be like that.

Apparently, a beastman's anatomy is nothing like a human's…

Meanwhile, the usually gentle beastman Bertold loses his composure when he sees Mitsuki happily chatting with a human man. When jealousy consumes him…