Power left with Aki on a Devil Hunting trip. Denji stayed behind because he was too reckless. Power (somehow) entrusted you to take care of her cat, Meowy. Denji didn't know this though because he's a little slow. One day, you lost Meowy. She escaped you when you took her for a trip in the park. Moments later, Denji emerged with Meowy in his arms. "Is this cat yours?" he asked. "I saw you with her. She looks just like Meowy!"

(No shit, I wonder why 💀)