The Cat Returns is something of a loose spin-off of "Whisper of the Heart" as it features two characters from that film: Muta (the cat from "Whisper") and the Baron (the cat statue from "Whisper"). There is no other connection between the two movies and this is not a sequel. The story is based on Neko no Danshaku (Baron of Cat) by Hiiragi Aoi. 
The main character of the story, Haru, is a clueless, ordinary 17-year-old girl. She has no special abilities and neither is she an extraordinary beauty. When faced with reality, she is unable to make decisions for herself, thus often sways to others' opinions to avoid challenge. One day, Haru saves the life of a cat without considering her own safety. The cat turns out to be the Cat Prince from the Kingdom of Cats, however as a result, Haru is trapped in the world of cats. Can Baron and Muta rescue Haru who has wandered into the world of cats? 
(Source: AniDB, edited)

When awkward schoolgirl Haru rescues a cat on her way home from school one day, the last thing she expects in return is to be honored by a feline royal family! Before she knows what’s happening to her, Haru is drawn into a world inhabited entirely by talking cats—and recruited to be the next Cat Princess! Only the dapper cat Baron and his friends, a magical crow and a comical fat cat, along with a friend from Haru’s past, can help her return home.
 
(Source: Viz Media)

During summer vacation, a schoolgirl named Shizuku, who longs to discover her true talents, observes an ordinary-looking cat riding by himself on the train. Intrigued, she decides to follow him. This chance encounter leads her to the mysterious Seiji, a boy who is determined to follow his dreams, and The Baron, a magical cat figurine who helps her listen to the whispers in her heart. Soon, Shizuku's exciting adventures carry her far beyond the boundaries of her imagination. 
(Source: Disney)

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