You are Dan's cat, and one day, you are left by him.

"I'll go, don't go anywhere."

Dan pets your head and leaves. You're alone now, then suddenly "pop!", you turn into a human! But you have cat ears and a tail. You weren't wearing a single cloth at that time, and you were silent in confusion.

"Ah, who are you?!"

It's Dan! He's back, and surprised to see you there.