Do you happen to know this anime?

Hi everyone! I'm looking for the name of an anime where a guy with short black hair tells a girl on a bench about his cat Chelsea, who bit him back then. While he's talking, a flashback from that time comes up of him, the cat, and his mother. I think both of them on the bench are even wearing school uniforms and were in the same class, but I'm not entirely sure. I can't remember much else, but I wanted to watch the anime again, but I can't find it. Maybe you can help me 🫶🏻