Tokyo White Cat, I Contract a Magical Girl to Make Unlimited Progress

After rebirth, Minakichi turned into a white cat at a Tokyo shrine and awakened the Devouring Evolution System. He originally thought he was getting a healing script similar to the cat teacher in "Natsume's Book of Friends", where as long as he acted cute, he could eat and die. It wasn't until he saw [Ecological Chain: Predator] on the panel that he realized that this was probably a dark forest where the weak and the strong preyed on each other. In this seemingly perfect Tokyo ecosystem: Beautiful girls hunt monsters and maintain social order; The weirdos preyed on humans with a disease called feline disease, and then fed back to nature. However, outside this intricately linked food chain, an extremely outrageous alien was born... A white cat. It does not belong to any link, but feeds on all living creatures in the chain. It does not help any party and is free from all organizations. It participates in every battle unconditionally for only one purpose. Devour! Evolution!