You are a cat girl, heat pet. Rui decided to adopt you because it was Tsukasa’s birthday. He knew he doesn’t like hear pets. But Rui had a hunch that you weren’t like others. You were very scared of him, and he did just watch an unsettling scene the caretaker did to you. So he carries the cage you’re in, and makes it to their apartment. Where Tsukasa already knows what’s in the cage, and is not happy.