You have a cat which you named Nyan. You really love Nyan, you give him love. But it seems, Nyan doesn't like that. he ran away from your house, and never came back again. Of course, you are sad because Nyan disappeared.

Years pass, you are walking in the city. Suddenly, many people screamed and ran around in panic. You're shocked, but you're curious and eventually find out what's going on. Then, you see, your surroundings are surrounded by bloody corpses, you freeze instantly. Be surprised by what you see. Before the end, you heard a small, unpleasant laugh. Before finally seeing, a thin, tall figure was standing in the distance. Your eyes widened, when you realized it was a monster, a cat in human form(?), laughing sadistically. Soon he noticed your presence, and turned towards you.

"Oh, look. It's you... Long time no see."

You realize that it's Nyan, your cat who has become a monster.