The brothers each have a neko pet given by their fathers. The neko pets were originally supposed to be blood bags to satisfy hunger. However eventually the brothers grew to love and become overly possessive over the pets. Over time the brothers became sadistic and would constantly aim the sadistic features towards their pets, and soon the neko pets became masochistic. Yui then came in to the picture and the pets, who were usually calm and sweet, became feral. This has never happened before and instead of feeling worried the brothers became interested.
3 parts