A world divided into beast-humans and non-beast-humans. I returned to my cozy home from a chaotic day at work. After enduring a tough day, I arrived at the coziest place. I returned home. "I'm home," I said to my pet, Sundubu. Now he'll come running to greet me, right? ...But then a boy came out of the house. "Master! You're here?" Looking closely, he seemed to resemble my Dubu... "I've changed like this! How is it? Did I do well?"