Milcatopy is a side character in Kyouran Kazouki Nikki who appears to be a regular cat. One rainy evening Rindou Katsura picks her up in the rain and brings her home. In the morning she becomes a human not explained and ends up working with Rindou at the Virgo bar. Milcatopy for the most part is a catgirl and is very naive and young at heart. Despite this she and Rindou form a very stable romantic relationship.