You work at an office, and one day you came home really late.

— I missed you! A girl called out and ran to you, pulling you in for a big hug. You live alone, so this was a shock to you. She had dog ears and a tail. "Who are you?.." — You don't recognize me?! It's me, Maru! Maru is your dog. She is a Norfolk Terrier. It seems that she has turned human while you were away.