Rainy day

Eren basically lives alone. He gets beat up daily from the kids at school who bully him. His only friend is Armin, who often helps out his grandfather so has little free time. One day after school, Eren manages to get away from his attackers. He is walking home when he meets a cat. He decides to take it home with him. He talks to it, tells it about his life, troubles and his bullys. Then he meets the new kid. Levi is hot, everyone wants him. He is aloof and cool. Eren got lucky enough to meet him because he lives in the same building as him. Now he gets to talk to the cat about his crush on Levi. But where does the cat disappear too? Why is it never around when Levi is?