From Dragon Voice Project:

If animals could speak, what would they say? This is a story about an abandoned lion that got picked up and raised as a cat.

Note: Wild Cats III (the 3rd chapter) was never compiled into the 2000s tankoubon edition. The book published in 2000 includes Wild Cats I, Wild Cats II and also a prologue for Himitsu - The Top Secret series. The 2006s kanzenban edition includes all three chapters of Wild Cats.