Chelsea was the cat of Kousei Arima when he was younger. Kousei loved playing with her, until one day, Chelsea scratched his hand, which led to his mother (Saki Arima) taking Chelsea away for abandonment.
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Kousei Arima named his cat Chelsea (ch-el-see) because she kept eating his candy. She is not the cat in the intro between episode 1-11, that is the cat with blue eyes.